[ Past Participle ]
Know knew ……
A. Knowing
B. Knewn
C. Knowed
D. Known

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would should couldComparative AdjectivePossessive Pronouns and Adjective PronounsRelative ClauseFamily Vocabulary and GrammarParticiple Clauses & Cleft SentencesFirst Conditional SentenceCountable & Noncountable NounsPrepositions and ConjunctionsModals of DeductionOther quiz:
Present Perfect › View___________________ to the USA?
A. Have he been
B. Did he been
C. Has he been
Grammar › View
Look at these dark clouds: It __________________ rain soon.
A. is raining
B. is going to
C. rains
D. will
Grammar › ViewI would do helped you what you if were
A. would
B. if
C. you
D. were
Grammar › View
___ he arrived late, he still managed to catch the train.
A. Although
B. Even though
C. Despite
D. However