Comparing Phrases
http://www.studyandexam.com/clause-phrase.html
Phrases
http://www.tameri.com/edit/phrases.html
Grammar Rules
https://www.grammarbook.com/grammar/clause-phrase.asp
Clauses and Phrases
https://web.cn.edu/kwheeler/gram_clauses_n_phrases.html
English Page
http://www.englishpage.com/index.html