是情态动词吗?
①只做情态动词:must,can,may……
②可做情态动词又可做实义动词：如：need,will,dare
③具有情态动词特征：have(had,has) to,used to,ought to
④可做情态动词又可作助动词：如：shall(should),will(would)
注：
mustn't代表强烈禁止 must表示主观,have to表示客观.
常用的：
can (could),may (might),must,need,ought to,dare (dared),shall (should),will (would)
(refer to baidu)