you should think it over before deciding to do this.这句话里before 后面可以加动词的ing形式吗

i think you should keep____(do) it. 适当形式 .you should think about it before making ...(decision) before you make a de determinationyou should think it i think you should try your best to learn it.(同义句)i think you should learn it _____ _____. do you think should gay marriage should be legalizedwhat do you think about gay marriage?should it be legalized? you should remember!i think If you think something is true,you should hold on to it.翻译 ( )we should be blamed for it.Awhom do you think Bwho do you think Cdo you think who Ddo you thinkwhom?选哪一个?为什么 --Whom should i give this dictionary to?--You may give it to ------A.whoever you think meeds it mostB,whomever you think needs it most you should buy it I think you should cry.It's a way to relax yourself. Since you think your English should be bettter than mine,let use it now You should think it clearly whether he is eligible for the job.有无语法错误 what do you think ---------do to protect wildlife?A should we B we should C it we shouldD it is we should 为什么选B 不选A You should think carefully before you _b___anything. -You think he is honest?-You have got it right,and you should believe in him.意思、、 you should think over it ____ you make your own decisionA.beforeB.afterC.thoughD.until为什么不选D