（一）关于利弊、优缺点的句型：（Some sentence patterns commonly-used in controlled writing: ） 1. S have (or has) a lot of advantages over…(与…相比有许多优点) Compared with B, A has (or have) many advantages. 译： 1）英语好是她的长处。 She has the advantage of good English. 2. be of great benefit to sb./sth. (对…有益) 3. …benefit sb./sth. (对…有好处) Benefit from sth. (由于…而受益) 4. …do (a lot of) good to sb. (对…有许多好处) …be good for sb./sth. (对…有益) …do damage to sth. (对…造成损坏) 5. …be as (not so) good as…, What he does is not so good as what he says. 6. …not so much…as…(与其说…, 不如说….) 7. It benefits us in many ways/respects. 8. Doing sth. is beneficial to… 9. While…has so many advantages, we should not ignore the problems it brings us. 10. Just as a coin has two sides, everything has its advantages and disadvantages.
（二）说明原因的句型：
1. There are two/ some/ many good reasons for… / to… 【Example】 There are two reasons for the changes in people’s living conditions. First, we have been carrying out an opening and reform policy. Second, our national economy is developing rapidly and the birth rate has been put under control.
2. We have two good reasons for… 【Example】We have many good reasons to object to smoking in public places. 3. The reason for…is that 【Example】The reason for my being late was that I missed the bus. 4. Several factors are responsible for the phenomenon. 5. Their opinion is based on the fact that… 6. Those who are in favor of the …believe that…