I’ll go to see you when I have time. I’ll go to see you if I have time tomorrow. 2. 某些动词，如：stand, continue, wish, love, like, hate, feel, find, think等常用一般现在时态
Tom goes to work every day. （经常的动作） The machine runs smoothly. (特征) He is very happy. (现在的状态) The earth moves around the sun. (客观真理)
一般现在时态的特殊用法：
1. 在时间和条件状语从句中，用一般现在 时态表示将来的动作。
在时间含义上是“过去的过去”，因此 句子中一般都有一个一个明确的状语或 状与从句来表示过去的时间。
I had studied in Beijing for three years by then. Until then he had known nothing about it. She had only been here for ten minutes when Jim came in.
补充说明：下列动词没有进行时态： 1. 表示状态的动词： seem, look(看起 来),appear, have(有)，belong to， own, hold(容纳)
This book belongs to me.
He appears very angry. 2. 表示知道、信念、理解、知识、推测、
2. 表示一种倾向或一种固有特性或经常发 生的动作。 意为“惯于，总是”
When it gets warmer, the snow will start to melt.
He had lived here before he went abroad.
一般将来时(will, shall) 1. 表示将来发生的动作或存在的状态，常 与表示将来的时间状语连用，如 tomorrow, next week, in a few days, next Sunday We will have a dictation tomorrow. He will be back in a few days.
怀疑、希望等含义的动词，如：know,
forget, remember, understand, see，think，believe, hope, doubt 等 I don’t understand why he did it.
I hope I can pass the exam.
一般过去时态： 1. 表示过去某时间发生的事、存在的状态 或过去反复发生的动作。常与表示过去 的时间状语连用，如：yesterday, last week ,during the night
2. 表示目前这段时间正在发生的动作。
He is writing his new novel these days. Those Americans are learning Chinese in Beijing.
现在完成进行时态： have / has been doing 1. 表示发生在过去，一直持续到现在的
几种常见时态的区别： 1 一般现在时态和一般过去时态：
He keeps doing morning exercise to keep fit. He felt cold so he sat closer to the fire. 2 一般过去时态和现在完成时态：
He opened the door. He has opened the door. 3 现在完成时态和过去完成时态： He has lived here since he came here.
动词的时态和语态
英语动词共有16种时态，最基本常用的有：
现在：一般现在时，现在完成时， 现在进行时，现在完成进行时
过去：一般过去时，过去完成时， 过去进行时，（过去完成进行时）
将来：一般将来时，将来完成时， 将来进行时，（将来完成进行时）
一般现在时：
1. 表示经常性、习惯性的动作；表示现在 的状态、特征、能力、客观存在或真 理。句中常用always, often, usually, sometimes, every day 等时间状语
动作，强调动作的连续不停顿。
Tom has been working hard since the new term began. Where have you been living these years?
2. 表示不久前刚结束的动作。 Sorry, I’m late. How long have you been waiting here?
He loves nature. I wish to be back soon.
现在完成时态： 1. 表示从过去某一时间一直延续到现在的
动作或状态，常用延续性的动词。 I have sat hours in the classroom reading a novel. The weather has been cold so far this winter. 2. 表示过去某一动作对现在造成的影响,谓 语动词常为非延续性的动词。
He suddenly fell ill yesterday. He worked in a factory in 2004.
2. 表示过去经常做的动作
When I was in the countryside, I often had a long walk after supper.
过去完成时态：
Have you ever considered moving to the south? I have locked the door.
现在进行时态： 1. 表示此时此刻正在进行的动作。
Are the students dancing? Look, me swans are flying past!