1、Whose_____(key)are these?2、My watch______(be)lost.3、Please______(call)Mary at 657-8035.4、________(you、he、I)are good friends.

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1、Whose_____(key)are these?2、My watch______(be)lost.3、Please______(call)Mary at 657-8035.4、________(you、he、I)are good friends.
1、Whose_____(key)are these?
2、My watch______(be)lost.
3、Please______(call)Mary at 657-8035.
4、________(you、he、I)are good friends.

1、Whose_____(key)are these?2、My watch______(be)lost.3、Please______(call)Mary at 657-8035.4、________(you、he、I)are good friends.
1,keys
are these 很明显要用负数形式
2.is
表示被动的be done 形式 be要跟着主语变动 my watch 是单数又没有特殊时态情况 所以用 is
3.call
祈使句 用动词原型就好
4.You he and I
人称排列就是这样 第二人称、第三人称、第一人称