was+v-ing;were+v-ing 6、现在完成时:has/have+v-过去分词 7、一般将来时:will+verb 三、助动词 1、现在时中:do,does 2、一般过去时:did 3、完成时中:done 四、情态动词 can,must,need,will,should,had better记住接原形就可以啦！四兄弟中，重点关注老二实义动词！他人数众多，变化千变万化，穿越过去...
Present Perfect Tense –“Has/Have/Had” These verbs indicate actions that are completed in relation to the present, with a focus on the result or effect. “Has” is used with singular subjects (he/she/it), and “have” is used with plural subjects (I/you/we/they)...
been being 2) verb to have: have has had 3) verb to do (dummy): do does did 4) modal verbs: can could must shall should will would may might *(ought to used to)参考: learnenglish.de/grammar/verbaux
2、g paper for two thousand years. 现在完成进行时:have/has+been+V.ing (现在已完成某持续动作) e.g. The Chinese have been making paper for two thousand years.将来完成进行时:shall/will+been+V.ing (将来的某个时间会完成某持续动作) e.g. The Chinese shall been making paper for two thousan...
现在完成时用来表示之前已发生或完成的动作或状 态，其结果的确和现在有联系。动作或状态发生在过去 但它的影响现在还存在；也可表示持续到现在的动作或 状态。其构成： have（has） +过去分词。用于现在完成时的句型 （1）It is the first / second time…. that…结构中的从句部分，用现在完成时。It is ...
The verbhaveand its forms: have, has, had, having The verb do and its forms: do, does, did can could might may must ought to shall should will would Let’s look closer at these helping verbs to figure out why we actually use them. ...
"He has died for three years" 这句话是错误的。国内语法是按照“持续动词”和 “瞬间动词“的方式进行解释的,就是说 die 这个动作不能持续 3年。 die 的确是瞬间动词,无法持续,所以固然不可以跟时间段,这是毫无争议的。 我困惑的地方是关于用「持续动词」和「瞬间动词」这两类动词来进行做区分是否跟时间...
Have, has, had Modal auxiliary verbs never change form. These include the following: May, might, must Shall, should Can, could Will, would Ought to Examples of Helping and Auxiliary Verbs in Sentences Shehadfoundthe solution to the locked safe; unfortunately, we couldn’t getpast the alarms...
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)注意 ①mustn't代表强烈禁止， must表示主观,是自发的，have to表示客观，意为不得不去做某事。②美式英语中常用must not ,mustn't是must not的缩写. mayn't,mightn't和shan't也很少...