“变成了”用英语怎么说？

要问的话要指出具体的语境，以上的回答大部分的都有了，
常用的become，turn into

tunr to

turn into

那要看你怎么用了。
become,turn out,change into,etc.

给你个例子吧，她已经变成了一只鸟。she has become a bird
她变成了一只鸟。 she became a bird

应该用become-became(原形－过去式)