[ Grammar ]
He ________ swim when he was four.
A. may not
B. musn´t
C. couldn´t
D. can´t

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Tenses › ViewThe cat ____________ on the mat.
A. sits
B. sleeps
C. jumped
D. running
Tenses › View
I have read these books
A. Simple Past Tense
B. Future Perfect Tense
C. Present Perfect Tense
D. Past Perfect Tense