can(could)能 may(might)可以 must 必须 shall(should)(必须)将要 一般第一人称连用 用在其他人称有命令的口吻 will(would)将要 dare(dared) 美 [der] 敢 疑问句 否定句 need 需要 have to 不得不 had better 最好
参考: https://wenku.baidu.com/view/26d37bff9b89680203d82567.html