talk about capabilty

the expression is used to ask and inform about someone capability to do something

NO	EXAMPLES	EXPLANATION
1.	I can swim very well	Can expresses capability in the present.
2.	I can’t either speak Japanese or Chinese	Can’t is the negative form of Can. It may be written can’t or cannot.
3.	The car could speed up to 200 km/hour before it was broken.	Could expresses ability in the past. Could is the past form of Can.
4.	I couldn’t ride motorbike when I was a child.	Couldn’t is the negative form of could.
5.	I am able to operate Microsoft Power Point quite well.	Be able to is another term expresses capability in the present. Be: am, is, are, have been, has been
6.	I was able to run 12 kilometers before I got twisted ankle.	Be able to is also used in the past. Be: was, were
7.	Mary will be able to take a make up exam.	Be able to is also used in future. Be: will
8.	Mr. and Mrs. Miller were unable to find an inexpensive apartment.	Be unable to is the negative form of be able to.

Interviewer      : I wonder if you can operate Microsoft Windows.

Interviewee     : Yes, Ma’am. I can operate Word, Excel, and Power Point as well.

   Besides, I’m able to  take short hands.

Interviewer      : Good. Can you speak Japanese or Chinese?

Interviewee     : I’m sorry, Ma’am. I can’t either speak Japanese or Chinese.

Customer : My motorcycle can’t run more than 60
kilometers per hour. It could run to 110
kilometers before. What can you do?
Mechanic : Let us check the engine and find out what
is wrong with it.
Customer : Can you fix it if the problem is major?
Mechanic : We’ll see what we can do and let you
know the result.