You use this when you are indicating the size or shape of something with your hands.
'They'd said the wound was only about this big,' and he showed me with his fingers.
“他们说伤口只有这么大。”他用手指比划给我看。
You use this when you are going to specify how much you know or how much you can tell someone.
I don't know if it's the best team I've ever had, but I can tell you this much, they're incredible people to be around.
我不知道这是否是我拥有过的最好的团队,但我可以这么告诉你,他们是非常棒的合作伙伴。
If you say this is it, you are agreeing with what someone else has just said.
'You know, people conveniently forget the things they say.'—'Well this is it.'
“你知道,人们会轻易地忘记自己说过的话。” “嗯,是这样。”
You use this to refer back to a particular person or thing that has been mentioned or implied.
The entire portfolio is worth $160,312. Of this amount, my investment is worth only $7,748.
整个投资组合价值为160312美元。在这当中,我的投资额仅为7748美元。
You use this to introduce someone or something that you are going to talk about.
This report is from our Science Unit.
这份报告出自我们的科学部。
You use this to refer back to an idea or situation expressed in a previous sentence.
There have been continual demands to put an end to this situation.
人们不断要求结束这种局面。
In spoken English, people use this to introduce a person or thing into a story.
I came here by chance and was just watching what was going on, when this girl came up to me.
我碰巧来到这里,正在看热闹,这时一个女孩向我走来。
You use this to refer to a person or thing that is near you, especially when you touch them or point to them. When there are two or more people or things near you, this refers to the nearest one.
This church was built by the Emperor Constantine Monomarchus in the eleventh century.
这座教堂是11世纪时君主康斯坦丁·莫诺马库斯建造的。
I like this coat better than that one.
我更喜欢这件大衣,而不是那件。
You use this when you refer to the place you are in now or to the present time.
This country is weird.
这个国家很怪。
This place is run like a hotel ought to be run.
这个地方经营得像一个酒店一样。
You use this to refer to the next occurrence in the future of a particular day, month, season, or festival.
this Sunday's 7:45 performance.
这个星期天7:45的演出。
You use this to refer to the medium of communication that you are using at the time of speaking or writing.
What I'm going to do in this lecture is focus on something very specific.
我在这次讲座中将集中讲解非常具体的问题。
this and that , this, that, and the other
If you say that you are doing or talking about this and that, or this, that, and the other you mean that you are doing or talking about a variety of things that you do not want to specify.
'And what are you doing now?'—'Oh this and that.'
“那么你目前在做什么?” “哦,各种事情。”
You use this to refer back to a particular person or thing that has been mentioned or implied.
I don't know how bad the injury is, because I have never had one like this before.
我不知道伤势有多重,因为我以前从未受过这样的伤。
You use this to introduce someone or something that you are going to talk about.
This is what I will do. I will telephone Anna and explain.
这就是我要做的。我会打电话向安娜解释。
You use this to refer back to an idea or situation expressed in a previous sentence or sentences.
You feel that it's uneconomical. Why is this?
你觉得这很不划算。这是为什么呢?
You use this to refer to a person or thing that is near you, especially when you touch them or point to them. When there are two or more people or things near you, this refers to the nearest one.
'If you'd prefer something else I'll gladly have it changed for you.'—'No, this is great.'
“如果您喜欢别的东西,我很乐意帮您调换一下。” “不用,这件很好。”
You use this when you refer to a general situation, activity, or event which is happening or has just happened and which you feel involved in.
I thought, this is why I've travelled thousands of miles.
我想,这就是我走了几千英里路的原因。
You use this when you refer to the place you are in now or to the present time.
This is the worst place I've come across.
这是我到过的最糟糕的地方。
You use this is in order to say who you are or what organization you are representing, when you are speaking on the telephone, radio, or television.
Hello, this is John Thompson.
你好,我是约翰·汤普森。