179. It is (not) necessary to...……是(没)有必要的。

1) I think it is necessary to look before you leap. 我觉得三思而后行是有必要的。

2) When invited, it is not necessary for you to bring any­thing with you. 去做客不一定非要带礼物。

178. It is (very /not) likely that... (很／没)有可能……。

It is likely that it will rain this afternoon. 今天下午很有可能下雨。

177. It's long been my dream to...……一直是我的梦想。

It's long been my dream to make a speech in English.　 用英语发表演讲一直是我的梦想。

176. It is important that... ……是很重要的。　 [主语从句使用虚拟语气]

It is important that something be done before it's too late.

在事情变得不能挽回之前采取一些行动是很重要的。

175. It is hoped that... 希望……。

It is hoped that no one was seriously injured in the car crash.

希望在这场车祸中没有人受重伤。

174. It is high time ... 现在是……的时候了。／早就应该……了。　 [从句使用虚拟语气]

It is high time we stopped talking about this silly ques­tion.

我们早就该结束讨论这个愚蠢的问题了。

173. It is good manners to do...……是有礼貌的表现。

It is good manners to bring along a small gift or some flowers when you are invited to dinner by a foreign friend.

如果外国友人邀请你共进晚餐，去的时候带上一份小礼物或者鲜花是有礼貌的表现。

172.It is essential that... 有必要……。　 [主语从句使用虚拟语气]

It is essential that effective measures be taken to protect our civil rights.

有必要采取有效的措施来保障我们的公民权利。

171. It is easy enough to...……相当容易。

It is easy enough to copy and paste; but you should write something by yourself.

抄袭(复制十粘贴)非常容易，但是你应该自己写一些东西。

170. It is easier to... than to...．．．．比．．．．．容易。

It is easier to buy a car than to keep one.　 买车容易养车难。