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often通常和一般现在时态连用,所以不会用-ing形式.置于用现单三形式还是原形,这取决用主语,如果主语是单数第三人称,那就用现单三形式,其他情况下用原形。
often后什么时候加s和ing
I often play computer games.She often plays computer games.
当主语是第一人称(I,We)、第二人称(You,You)或者是第三人称复数(They,students,teachers.)时,often后面的动词不加-s
当主语是第三人称单数(She,He,It,人名.)是often后面动词加-s ing是不用加的，应该没有这个说法。
often后面加动词原形还是加s，这是分情况的。若主语为第三人称单数（他，她，它），则动词应变为第三人称单数形式。多数动词后跟s，特殊的动词会跟es,如：do-does,go-goes.若主语为除第三人称单数外的人称（你，我，你们，我们，他们，她们，它们），则动词应为原形，不做改变。
often用法有哪些
often
英 [ˈɒfn] 美 [ˈɔ:fn]
adv.
经常;常常;时常;再三
比较级： more often 最高级： most often
adv.
1.时常；常常
many times
同义词： frequently
We often go there.
我们常去那里。
I've often wondered what happened to him.
我时常纳闷他出了什么事。
How often do you go to the theatre?
你多长时间看一次戏？
I see her quite often.
我常常见到她。
Try to exercise as often as possible.
尽可能经常锻炼。
We should meet for lunch more often.
我们应该更常一点相聚在一起吃午饭。
It is not often that you get such an opportunity.
你得到这样的机会，可不是常有的事。
2.往往；大多
in many cases
同义词： commonly
Old houses are often damp.
老房子大多都潮湿。
People are often afraid of things they don't understand.
人往往对自己不懂的东西感到恐惧。
All too often the animals die through neglect.
动物因缺乏照料而死亡的事司空见惯。
as often as not
more often than not
通常；往往；一贯
usually; in a way that is typical of sb/sth
As often as not, he's late for work.
他上班往往迟到。
every so often
有时；偶尔
occasionally; sometimes
once too often
侥幸难再
used to say that sb has done sth wrong or stupid again, and this time they will suffer because of it
You've tried that trick once too often.
你故技重施，可这次再逃不脱了。