非延续性动词能用于完成时态
Non-continuous verbs can be used in the perfect tense
非延续性动词（也称瞬间动词或瞬时动词）描述的是短暂且不可持续的动作或状态，一般不能直接用于完成时态来表示动作持续一段时间。但是，非延续性动词可以通过转换为相应的延续性表达方式，或者与其他表达时间段的短语结合，从而在特定语境中用在完成时态中。
例如：
1. 不正确的用法（非延续性动词直接用于完成时态）：*He has joined the club for two years.*（join为非延续性动词）
正确的改写：*He has been a member of the club for two years.*
2. 非延续性动词与for/since引导的时间段搭配时，需要转换为相应的延续性含义的动词或短语：*They have lived in this city since they got married.*（get married是非延续性动词，改为live in）
所以，虽然非延续性动词本身不直接用于表示完成时态的动作持续性，但通过变换表达方式，它们能够适应完成时态的要求，表达过去某一时刻开始并持续到现在的动作或状态。
现在完成时态
1. 用法：①过去发生的动作对现在造成的影响或结果：强调结果
例：Yesterday I finished my homework, that’s to say, I have finished my homework now.
②过去已经开始一直持续到现在的动作或状态：强调继续
例：I have lived here since 1990.
2. 现在完成时的构成 have/has+过去分词
3. 现在完成时的四个基本句型
肯定句 He has finished the work. 一般疑问句 Has he finished the work?
否定句 He has not finished the work. 两回答Yes ,he has. No, he hasn’t.
特殊疑问句 What has he done?
4. 在下列情形下用现在完成时
1常见标志词
①already 已经 肯定句中或句尾 例: I have already found my pen. = I have found my pen already.
②yet已经 否定句和疑问句句尾 例：I have not finished the work yet.
Have you bought a computer yet?
③ever曾经 句中 例：Have you ever seen pandas?
④never从不 句中 例：I have never been to Beijing.
⑤just刚刚 句中 例：I have just done my work.
⑥before以前 句尾 例：I have never been there before.
⑦so far到目前为止 例：So far he has learnt 200 words.
⑧ since 自从 例：I have lived here since I was born.
⑨recently 最近，近来 例：What have you done recently?
(10)for 例：She has been dead for a year.
干货｜英语语法：如何使用非延续性动词
英语动词按其动作能否延续，可分为延续性动词与非延续性动词。例如，learn, live，write等为延续性动词；come，leave, die，go， come, give，stop等非延续性动词。#英语#
非延续性动词在现在完成时的肯定式和疑问句中一般不能与表示一段时间的状语连用。当含有短暂性动词的句子有表示一段时间的状语时，可用下列几种方式表达。
01
用副词ago 作状语，把完成时改为一般过去时。
例如， 我的兄弟参军两年了。
My brother has joined the army for two years.( 错误表达）
My brother joined the army two years ago( 正确表达）
