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EXPRESSING OBLIGATION

Read the following expressions and learn how to use it.
1. Obligation in the present:
-          I should finish my work before this evening.
-          I should see the doctor soon because I don't feel well.
-          I should come to school.
-          You should behave better!

2. Obligation in the past:
-          Anggi should have booked the ticket in advance.
-          I should have come to her party.
-          You should have finished your homework yesterday.

3. Obligation in the future:
-          You should take a rest because you will have a test tomorrow.
-          I should learn English if I want to live in the USA.

Note:
  • Must / have to = 100% obligation. "When the traffic light turn red, you must stop."
  • Should = 50% obligation. It's more an advice than an obligation. “You look tired. You should have a rest."

Dialogue:
Policeman        : Don’t you know that you must stop when the traffic lights are red?
Driver              : Sorry sir. I was so stupid that I didn't pay attention to the traffic lights.
Policeman:       Well sir, you'll have to pay a fine!

Should With Simple, Continuous And Perfect
Should Have Something 
It was a great party last night. You should have come. Why didn't you? (= you didin't come but it would have been good to come.)
I'm feeling sick. I shouldn't have eaten so much chocolate.
She shouldn't have been listening to our conversation. It was private.

Expectation
When something is not right or what we expect.
I wonder where Liza is. She should be here by now (= she is not here yet, and this is not what is the reason of adding 'ing' to verb after 'should be'. e.g. should be playing VS should play.
(There are differences in time).

1.1). I should go home. (A fact is stated. No time is specified).
1.2). I should be going home. (The action should have already started or should right now start).
1.3). I should be gone home. (I should not be here now).
2.1). We should specialize in semiconductors. (A fact. No time specified).
2.2). We should be specializing in semiconductors. (The work should already be under way).
2.3). We should be specialized in semiconductors. (We should have papers that prove we are specialists in semiconductor work).

http://www.englishpage.net/showthread.php?19740-Should-verb-VS-should-be-verb-ing





1.      The modal verb should expresses weaker obligation than must and have to.
Should: 
expressing obligation
Structure: should + infinitive form of a verb 
should be, should go, should do, etc.
We use should for the present and the future.

We use should to give advice to someone and to say that something is a good idea.
Should is weaker than have to and must.
You should tell them the truth.

You shouldn't smoke; it's bad for you. 

I don't think you should do it.

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