He has been to the USA for three times.
否定句：
He hasn't been to the USA for three times.
疑问句：
Has he been to the USA for three times?否定句，疑问句后面不用加yet么？？？还有在has后面加already可以么？？不一定要加yet也不用加？我们书上好像不是这样写的加了以后只是语气强一些而已。 好， 加吧 He has【already】 been to the USA for three times.否定句：He hasn't been to the USA for three times 【yet】.疑问句：Has he 【already】been to the USA for three times?