有读者问：有一本英文正错句手册说：
(1)Wrong: He seemed not to hear me.
(2)Right: He didn't seem to hear me.
但我们在高中英语教材中既遇到：
(3)Pierre seemed not to have heard the news.
也遇到过：
(4)She didn't seem to like the idea.
孰对孰错，请回答。
上面所举的4个句子，用seemed not to也好，用didn't seem也好，都是正确的，意思也完全一样，只是前者多用在正式文体中，后者多用在非正式文体中而已。
