区分be able to和can.My brother( )swim very well.介词填空.The boy is

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区分be able to和can.My brother( )swim very well.介词填空.The boy is excited( )the good news.

1．can只有“现在式和过去式”；
I can swim.
He could run after the bus ancatch catch it twenty years ago.
be able to除了有“现在式和过去式”外,还有“未来和完成”的概念.
Can you ride on a bicycle
I shall not be able to come again today.
I shall have been albe to do something.
2．过去式的“could”表示过去的“能力”、“潜力”和“可能性”.如：
Lanny could run and was a good tennis player
I could run after a bus and catch it twenty years ago
过去式的“was/were was/were able ”不能单纯的表示过去的“能力”、“潜力”和“可能性”；只能表示“能力 + 成功的完成一个动作”而且更加侧重强调后者.
填空题答案：
can
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区分be able to和can.My brother( )swim very well.介词填空.The boy is my brother likes swim ,he can swim very well 改错一、适当词填空1.My brother is ______ to swim and swims well.2.The s 填空 1 The s＿can swim very well. 用can和be.able to填空 The boy _____me is my brother(用适当的介词或副词填空） The boy () () me is my little brother 用适当的介词填空 1.sing,my,can,brother,well,very.2.park,they,are,going,the,to Will she （）swim soon?A.can B.is able to C.be able to D.able They__do well in the exam A,can be able to B. be able to C.c The boy is( )brave.He is able to swim( )the river.A enough , my father can swim evry well 对very well 提问