其他情態(tài)動詞舉例：
can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) must
四大分類
①只做情態(tài)動詞:may, might, must..
②可做情態(tài)動詞又可做實義動詞：如：need, dare,can
③具有情態(tài)動詞特征：have(had,has) to,used to, ought to
④可做情態(tài)動詞又可作助動詞：如：shall(should),will(would)
注意：mustn't代表強烈禁止 must表示主觀，have to表示客觀。美式英語中常用must not 而不用 mustn't. mayn't,mightn't和shan't也很少用