About and on

Compare:

-a book for children about Africa and its people

A text book on Africa history

- a conversation about money

A lecture on economics

We use about to talk about ordinary, more general kinds of communications.
On suggests that a book, lecture, talk etc is series or academic, suitable for specialists.
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این هم چند تا اصطلاح انگلیسی

Dig oneself in جا خوش کردن  

Hang fireپا در هوا   

Any port in a storm لنگه کفش کهنه در بیابان نعمت است

Beg the question ماست مالی کردن   

A dead cert رد خور ندارد   

Free-handedدست و دلباز

Mark timeدر جا زدن

Quantifiers & determiners

Some and any; some thing, some body, etc.
A. Some and any: general
Some and any are used with plural and uncountable nouns, usually when we are talking about
* Unknown or uncertain amounts or numbers of things:
Some is used...
• In affirmative sentences (sentences which are not negatives or questions)
• She had some doubts about the decision.
• I had some trouble building the wall.
• In questions where we expect agreement
Or the answer 'Yes'
• Didn't John's parents give him some money? (= I think/expect they did)
• Hasn't there been some discussion about the proposal? (= I think/expect there has)
Any is used...

Verb + ing

Verb + ing Stop        enjoy       dislike         admit       consider      miss Finish      mind       imagine       deny        involve        postpone Delay       suggest    regret         avoid       practice       risk If these verbs are followed by another verb, the structure is usually verb + -ing:  ☻Stop talking!  ☻I’ll do the shopping when I’ve finished cleaning the apartment.  ☻I don’t miss working late every night.  ☻Have you ever considered going to live in another country?  ☻I can’t imagine George riding a motorcycle.  ☻When I’m on vacation, I enjoy not having to get up early. The following expressions also take -ing: Give up (=stop)                      keep or keep on (= do something  go on (= continue)                continuously or repeatedly) put off ( = postpone)                                             ☻ Are you going to give up smoking?  ☻ He kept (on) interrupting me while I was speaking Note the passive form (being done / being seen / being told, etc.): ☻ I don’t mind being told what to do. You can not normally use the infinitive (to do/to dance, etc.) after these verbs and expressions: ☻ I enjoy dancing. (Not to dance) ☻Would you mind closing the door? (Not to close) ☻Jill suggested going to the movies. (Not to go) When you are talking about finished actions, you can also say having done/having stolen, etc. But it is not necessary to use this form. You can also use the simple -ing form for finished actions: ☻ He admitted stealing (or having stolen) the money. ☻ They now regret getting (or having gotten) married. With some of the verbs in this unit (especially admit, deny, regret, and suggest) you can also use a (the) … structure: ☻ He denied that he had stolen the money. (Or denied stealing) ☻ Jill suggested that we go to the movies. (Or suggested going)

Usefull tips

At work today,my boss told me that I must stop to sleep.  (incorrect)

At work today, my boss told me that I must stop sleeping.   ( correct )  

 reason :

If you stop to sleep, it means that you stop what you are doing in order to sleep.

 Example:  when I was walking home, I stopped to buy a news paper

Maybe repetitive but I think it is fun to read again