问题: 写出下列动词的単三形式及过去式
1.stay( ) ( )
2.study( ) ( )
3.buy( ) ( )
4.bring( ) ( )
5.think( ) ( )
6.stop( ) ( )
7.throw( ) ( )
8.hit( ) ( )
9.is( ) ( )
10.forget( ) ( )
11.begin( ) ( )
解答:
stays stayed
studys studied
buys bought
brings brought
thinks thought
stops stopped
throws threw
hits hit
is是be的三单形式 was
forgets forgot
begins began
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