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were, doing did, do had, done have, done
couldn’t hear mustn’t hear couldn’t have heard wouldn’t have heard
I heard I had heard did I hear have I heard
heard heard of heard from have heard
heard to hear hearing have been heard
heard heard of listened to listened
hear have heard be heard hearing
heard about have heard about heard have heard
have heard from since have
a; a a; the 不填; 不填 the; 不填
being sung, sang sang, singing sung, sing to be sung, to sing
situations facts chances possibilities
In case Though Even In spite of
Do you have Did you have have you had Had you had
heard of heard about heard from heard
heard will hear have heard had heard
might not have heard should not have heard mustn’t hear shouldn’t hear
have heard from since have
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