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看见生人就想咬，见了主人摇尾巴。
（打一动物）
燕子
鸭子
狗
swallow
duck
A:Can it fly?
B:Yes, it can do it very well now.
But it couldn't do it at all when it was a child.
now
when it was a child
A:Can it ...?
B:Yes, it can ....
But it could/couldn't ....
-------- swim-----
very well
a little
now
in the past
two years ago
now
very well
not...at all
A:Can he/she ...?
B:Yes, he/she can ...
But he/she could/couldn't ...
when he was five
not...at all
a little