1. only [既是强调句,又是倒装句]
eg. Only in this way can you hope to improve the present situation.
2. It is …that…
eg. It is because he was too careless that he failed in the exam.
3. nothing but 只不过;只有…
eg. If what we have been striving for is nothing but pleasure-seeking, our nation will be deprived of the right to rise.(这里nothing but 可以去掉,不影响句意,但有了nothing but,就强调了后面的名词)