Both Wonder World and Here We Go teach weather adjectives with the question patttern  "How's the weather? It's ____." Both books extend the sentence pattern with city locations as well. Wonder World's optional lesson teaches extreme weather conditions like drought and flood while it's grammar lesson introduces morphology: weather adjectives contain the related noun inside them, e.g. cloudy--> cloud. Here We Go's optional lesson teaches weather symbols and extension  vocabulary mentioned in weather reports, e.g. partly cloudy, stormy, etc. The grammar lesson teaches the different intonations in yes/no questions and 5W1H questions.

Both Wonder World and Here We Go teach time with the question patttern  "What time is it? It's ____ o'clock." Both books extend the sentence patterns with half hour or quarter hour increments expressed as numbers of minutes (NOT FRACTIONS OF THE HOUR). Wonder World's optional lesson teaches good routines and time zones, while it's grammar lesson contrasts the intonation patterns of ---teen and tens (forty vs. fourteen). Here We Go's optional lesson teaches famous landmark clocks around the world, and its grammar lesson also teaches --teens vs tens.

Wonder World teaches the stationery vocabulary in the context of ownership and possessive pronouns, whereas Here We Go teaches demonstrative pronouns, since this lesson occurs earlier in the 3rd grade. Wonder World's grammar lesson teaches the morphosyntactic relationship between personal pronouns and possessives, while Here We Go focuses on spaces between words for proper penmanship. The optional learning in Here We Go teaches information found on book covers, while the optional learning in Wonder World teaches honesty by returning found items and extension vocabulary "Lost and Found."

Both Wonder World and Here We Go teach the preposition vocabulary by applying them to answer the question, "Where's my __<stationery/object>?" Wonder World contextualizes the lesson with a story about earthquake drills, so the optional learning teaches the concept of a "go bag" and the items contained within. The grammar lesson teaches how to count syllables in words. Here We Go is a bit conceptually disorganized in this unit (an example of the general incoherence pervasive in the Hanlin books that leads me to prefer Kang Hsian)  as the "grammar lesson" teaches the prepositions, while the main lesson also teaches prepositions in addition to extra household object/furniture vocabulary. The optional learning in Here We Go springboards from the vocabulary item "computer" to teach the parts of the computer as extension vocabulary.

Both Wonder World and Here We Go teach the rooms of the house by applying them to answer the questions about the location of friends and family members.  Wonder World's optional learning lessons teach the concept of saving energy by turning off lights and appliances in the rooms and also introduces the concept of sectional living spaces in RVs. The grammar lesson reviews question words already studied (Who, Where,  What) by contrasting the different  answer patterns. Here We Go's grammar lesson also reviews the same three question words while the optional learning springboards from the fairy tale story in the main lesson to teach the distinction between fiction and non-fiction literature.

Both Wonder World and Here We Go teach present continuous aspect with identical question and answer patterns. Wonder World's optional learning lessons teach the good habit of focusing on one task at a time and also springboards from the activity of eating dinner to show culturally different eating habits. The grammar lesson teaches the different types of morphology when transforming  verbs into present continuous aspect. Here We Go's grammar lesson also reviews the same three types of present continuous spelling transformations while the optional learning teaches parts of the coconut tree which springboards from the unit story which takes place in Thailand.

Wonder World teaches food and drink vocabulary with the question pattern "What do you want for lunch?" The optional learning uses food vocabulary to teach food waste and good habits to avoid waste, as well as ordering from a kiosk. The grammar lesson makes students notice the plural 's' with countable foods.  Here We Go also teaches countable food and fruit exclusively in unit 3 with the plural demonstrative pronouns "These/those" and leaves the concept of "want" to unit 4 with drink vocabulary. The optional learning teaches the types of fruit plants (trees, bushes, vines). The grammar lesson contrasts singular/plural demonstrative pronouns "this, these, that, those." Here We Go Unit 4 teaches the uncountable drink and food vocabulary with the offer "Do you want some ___?" The optional learning springboards from the uncountable vocabulary "ice cream" to teach different iced desserts around the world. The grammar lesson distinguishes countable/uncountable foods/drinks.

Both Wonder World and Here We Go teach animals in plural form with yes/no questions of preference. However, Here We Go also adds quantities of animals with the existential statement "There are..." Wonder World's optional learning lessons teach the good habit of being nice to animals and also teaches two new habitat items, "forest" and "grassland". The grammar lesson reviews the distinction between existential yes/no questions and yes/no questions of preference. Here We Go's optional learning teaches animals unique to Australia, meanwhile at Book 5, the grammar lessons have been replaced with reading comprehension lessons.  In this unit students need to identify which animals are liked or disliked by a character in the series.