1) conditionals: using "if"/...

# relevant: simple future & future progressive with if clauses (feature vs. habitual present)

Conditionals (zero,1st,2nd,3rd,mixed) / If clauses
source: web english

Zero Conditional
source: TeacherPhilEnglish 

zero & first conditional
source: EnglishLessons4U    2012年5月9日

quiz: http://www.engvid.com/zero-and-first-...

1st conditional
source: TeacherPhilEnglish

2nd conditional
source: TeacherPhilEnglish

second & third conditionals

source: English Teacher Jon      2012年5月25日
 
Using The Conditional -'if'
source: learnexmumbai 

Mixed Verb Tenses in English: Conditionals and IF clauses
source: English Lessons with Adam   2016年4月15日
Do the quiz at http://www.engvid.com/mixed-verb-tens... 

UNLESS & IF NOT - negative conditional
source: EnglishTeacherAdam