用BE的恰当形式填空.(1)I [ ]THIETEEN.(2)THIS [ ]MY FRIEND.(3)WE [ ] ALL GOOD FRIENDS NOW.

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用BE的恰当形式填空.(1)I [ ]THIETEEN.(2)THIS [ ]MY FRIEND.(3)WE [ ] ALL GOOD FRIENDS NOW.
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用BE的恰当形式填空.(1)I [ ]THIETEEN.(2)THIS [ ]MY FRIEND.(3)WE [ ] ALL GOOD FRIENDS NOW.
用BE的恰当形式填空.
(1)I [ ]THIETEEN.
(2)THIS [ ]MY FRIEND.
(3)WE [ ] ALL GOOD FRIENDS NOW.

用BE的恰当形式填空.(1)I [ ]THIETEEN.(2)THIS [ ]MY FRIEND.(3)WE [ ] ALL GOOD FRIENDS NOW.
am
is
are
注:be是系动词的原型,要根据句子变换时态形式.

am
is
are

1.am 2. is 3. are