句型1 there be句型

　　比如There is an argument that whether more languages or fewer ones is better, in my opinion, fewer languages is a right choice.

　　常见的there be句型有：

　　现在有

　　there is/are …

　　过去有

　　there was/were…

　　将来有

　　there will be…/there is /are going to be...

　　现在已经有

　　there has/have been…

　　可能有

　　there might be...

　　肯定有

　　there must be …/there must have been...

　　过去一直有

　　there used to be …

　　似乎有

　　there seems/seem/seemed to be …

　　碰巧有

　　there happen/happens/happened to be …

　　此句型有时不用be动词，而用 live, stand, come, go, lie, remain, exist, arrive等。

　　句型2 it is句型

　　比如It is an argument that whether more languages or fewer ones is better, in my opinion, fewer languages is right choice.=personally, I prefer fewer languages.

　　常见的it is句型有：

　　It is important/vital/crucial/pivotal/essential/significant(…很重要)

　　It is clear/evident/obvious/manifest/as clear as crystal/quite common（...很明显）

　　It is undoubted/undeniable/doubtless （…毋庸置疑）

　　It is a pity/a shame/a common sense/practice that

　　It is well/increasingly/widely/commonly/generallyknown/recognized/accepted/acknowledged(众所周知)

　　It is conceivable that 可想而知

　　It is desirable/admirable that 可取的

　　It is advisable that 最好做某事

　　It is probable/possible/likely that 可能的

　　It is imperative that 必要的

　　it is preferable/profitable that

　　It is hazardous/risky/perilous that 危险的

　　It must be stressed out that 必须要指出

　　It must be admitted that 必须要承认

　　It is always the case that 情况总是这样的

　　It is not always the case that  情况不一定总是这样的

　　It follows that由此可见