他已经去过美国三次了.翻译成英语,改成否定句和疑问句!

问题描述:

他已经去过美国三次了.翻译成英语,改成否定句和疑问句!

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?