Might

MIGHT

It isn't common in American English.
We can use might to talk about:

•  possibility.
• make suggestions or requests.
• and often in conditional sentences.
• 

Difference between could and might

Difference between could and might

Could is when we are able to do something and
Might is when we thought of doing something.

Can - Could and Be able to

We use can, could and be able to:

To talk about natural or learned ability.
It is something that Can,could and Be able to have in common.

We use can to talk about:

ability and possibility
make request
ask for or give permission

We use could to talk about:

Past ability
possibility
polite request
suggestion
conditional of can

We use be able to:

To talk about ability.

Why is grammar important

Grammar is very important:

Because if we know grammar we are going to do a lot of sentences with a correct structure and so grammar help us to develop our language skills.
If we know grammar we are going to be able to share our ideas, knowledge and things so on.

Grammar

Rules of grammar

There are some rules:
One of them is:
1.-Use active voice
2.-Link ideas with a conjuction
3.-Use a serial comma in a list
4.-Use the semicolon to join two ideas
5.-Use perfect tenses

MUST

Using "Must" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "must" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
must certainty	1. That must be Jerry. They said he was tall with bright red hair. 2. That must have been the right restaurant. There are no other restaurants on this street. 3. NO FUTURE FORM	1. That must not be Jerry. He is supposed to have red hair. 2. That must not have been the right restaurant. I guess there is another one around here somewhere. 3. NO FUTURE FORM	have to
must not prohibition		You must not swim in that river. It's full of crocodiles. You must not forget to take your malaria medication while your are in the tropics. Prohibition usually refer to the near future.
must strong recommendation (Americans prefer the form "should.")	1. You must take some time off and get some rest. 2. SHIFT TO "SHOULD" You should have taken some time off last week to get some rest.  3. SHIFT TO "SHOULD" You should take some time off next week to get some rest.	1. You mustn't drink so much. It's not good for your health. 2. SHIFT TO "SHOULD" You shouldn't have drunk so much. That caused the accident. 3. SHIFT TO "SHOULD" You shouldn't drink at the party. You are going to be the designated driver.	should
must necessity (Americans prefer the form "have to.")	1. You must have a permit to enter the national park. 2. SHIFT TO "HAVE TO" We had to have a permit to enter the park. 3. We must get a permit to enter the park next week.	1. SHIFT TO "HAVE TO" We don't have to get a permit to enter the national park. 2. SHIFT TO "HAVE TO" We didn't have to get a permit to enter the national park. 3. SHIFT TO "HAVE TO" We won't have to get a permit to enter the national park.	have to

REMEMBER: "Must not" vs. "Do not have to" "Must not" suggests that you are prohibited from doing something. "Do not have to" suggests that someone is not required to do something.

Should

"Should" is most commonly used to make recommendations or give advice. It can also be used to express obligation as well as expectation.

Examples:

• When you go to Berlin, you should visit the palaces in Potsdam. recommendation
• You should focus more on your family and less on work. advice
• I really should be in the office by 7:00 AM. obligation
• By now, they should already be in Dubai. expectation

Using "Should" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "should" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
should recommendation, advisability	1. People with high cholesterol should eat low-fat foods. 2. Frank should have eaten low-fat foods. That might have prevented his heart attack. 3. You really should start eating better.	1. Sarah shouldn't smoke so much. It's not good for her health. 2. Sarah shouldn't have smoked so much. That's what caused her health problems. 3. Sarah shouldn't smoke when she visits Martha next week. Martha hates when people smoke in her house.	ought to
should obligation	I should be at work before 9:00. We should return the video before the video rental store closes. "Should" can also express something between recommendation and obligation. "Be supposed to" expresses a similar idea and can easily be used in the past or in negative forms.	NO NEGATIVE FORMS	be supposed to
should expectation	1. Susan should be in New York by now.  2. Susan should have arrived in New York last week. Let's call her and see what she is up to. 3. Susan should be in New York by next week. Her new job starts on Monday.	1. Susan shouldn't be in New York yet. 2. Susan shouldn't have arrived in New York until yesterday. 3. Susan shouldn't arrive in New York until next week.	ought to, be supposed to