be +形容词+to do something还是doing sth

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be +形容词+to do something还是doing sth

be +形容词+to do something还是doing sth
be +形容词+to do something还是doing sth

be +形容词+to do something还是doing sth
不一定.be busy doing sth
be afraid to do

有to do sth的,也有doing sth。
例如 I am happy to meet you .
I am busy working

应加to do something