sb.with sb.often do sth.中的do是原形还是第三人称?

sb.with sb.often do sth.中的do是原形还是第三人称? 是offer sb sth还是 offer sb to do sth? sb with sb to do sth 主语是哪个呀 let sb do sth 中 是指动词原形吗? 是drive sb to do sth还是drive sb do sth allow sb to do sth 还是 a "think sb do sth"当sb是第三人称单数时,do要加s吗? let sb.do sth.该否定句是let sb.not do sth.还是let sb.not to do sth help 后边接动词不定式还是动词原形?有没有help sb,do sth.help sb,to do sth,help make sb.do sth,还是make sb.to do sth. ask sb do sth 还是 ask sb to do sth . have sb do sth 还是 have sb to do sth? have sb do sth 还是have sb to do sth