◇It was a European chemistwho produced the medicine.(强调主语)
◇It was him that we met at the school gate.(强调宾语)
◇It was at three o'clock that we finished the work(强调状语)
强调句中,引导词一般用that,that只起连接作用,没有实际意义,而且不能够省略掉。指人时,that可以用who替代,其他情况下均用that。
◇It is our parents who/that we depend on when we are in trouble.
当我们遇到困难时是我们的父母值得依靠。(所强调的是人,所以who和that都可以用)
◇It is a wallet that he picked up.
他捡起来的是一个钱包。(所强调的wallet是物,只能用that)