It is clear / obvioius/ true/ possible/ likely / ... that...
It is obvious that he is accustomed to nicotine.
It is said/ reported/ believed /... that ...
It′s reported that the production has been put into use.
It is a pity / a shame that...
It is a pity that you can′t attend my wedding next Monday.
It happens/ occurs/matters/ ... that...
It happened that I met an old friend in the club.
It is no good / no use/ no pleasure / ... doing / It is easy / hard /... to do
It is better to do enough exercise.
It is/ has been + 时间段+ since 从句
It has been 18 months sInce we came to Jingbian Midddle School.
It was / will be + 时间段+ before 从句
It wIll be 18 months before we go to our ideal university.
It wasn't / won't be + 时间段+ before 从句
It won't be long before we meet next tIme.
It takes sb some time to do sth
It took him a long time to aquire the skills he needed to become a good learner.
It is/ was the first/ second/... time that sb have/ has/ had done sth.
It was the first time that I had come to Beijing then.
