哪些词做主语，谓动用三单？情态动词后能有时态吗？
1. 当可数名词单数/不可数名词/单数形式的第三人称代词作主语时，谓语动词用第三人称单数形式。当然有时候会有一些干扰，比如 books of this kind，这种类型的书，主语是books而不是kind，注意找对主语。而且还有一些特殊的关于主谓一致问题的语法规定，需要系统学习。
2. 在不表示推测、不是虚拟语气的情况下，情态动词后面始终接动词原形，没有时态，但是可以有被动语态。
但是如果是虚拟语气结构，比如could have done这种结构，表示"本来能做的事情未做"，是一种虚拟语气，还是有分别的。
还有情态动词表示推测的时候，推测过去发生的事情，后面的动词是需要用have done这种完成时态的形式的，如果推测正在发生的事情，需要用be doing这种进行时态的形式的。
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绛旓細闂涓:浠涔堟椂鍊欑敤涓夊崟褰㈠紡 褰撲富璇槸涓夊崟鐨勬椂鍊欑敤銆傛瘮濡:he she it marys 闂浜:浠涔堟椂鍊欑敤鍗曚笁 鍗曚笁,鍗崇涓変汉绉板崟鏁,娉ㄦ剰涓ょ偣:涓鏄滅涓夆,鎸囩殑鏄櫎浜嗏滄垜(浠)鈥(I,we)鍜屸濅綘(浠)鈥(you)涔嬪鐨勪汉绉;鍗曟暟,鎸囩殑鏄濅竴涓,缁煎悎涓ょ偣,绗笁浜虹О鍗曟暟灏辨槸鎸囬櫎浜嗘垜/鎴戜滑,浣/浣犱滑涔嬪鐨勮〃绀轰竴涓暟閲忕殑...
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绛旓細family 鍦ㄨ嫳璇腑鏃㈠彲浠ヨ〃绀"瀹跺涵"锛屽張鍙互琛ㄧず"瀹堕噷浜"銆傛墍浠ワ紝褰撳畠琛ㄧず"瀹跺涵"鏃跺簲璇ヨ瑙嗕负绗笁浜虹О鍗曟暟锛屽:Our family is a five-good family. (鎴戜滑瀹舵槸涓涓簲濂藉搴)濡傝〃绀"瀹堕噷浜"鏃跺簲璇ユ槸澶嶆暟锛屽: Our family are going to Hainan this summer. (鎴戜滑瀹朵汉浠婂勾澶忓ぉ鍑嗗鍘绘捣鍗椼)...
