have more than one value, so let’s look at it on examples.
1) She should finish her homework. – “She should finish her homework. She should finish her homework.”
Here should is applied in the meaning of moral duty. Perhaps you will be reminded of using the verb must. When a person is not forced into action, and he himself feels his obligation in doing the action, the verbs should and must can be used.
2) Maybe l should make some tea. – “Perhaps I should brew some tea.”
3) I think, you should stay in bed. — “I think you should stay in bed.”
The examples present the most famous meaning of the verb: advice. The word should in this case can be translated as “worth”.
4) You should not go there. — “You shouldn’t go here.”
In such a context, the negative form of should is used in the meaning of soft prohibition. Can be translated as “not worth” or “undesirable”. But friends or relatives will almost exactly say, “You mustn`t.”
5) Why should I do it? – “Why should I do this?”
phrase is immediately memorized and used at any appropriate (and not very) moment. If you are offered stupidity or insist that you do something, say, “Why should I do it?”.
6) Should + have + V3 Many
don’t know, but with the help of should you can prick a person. This prick will sound soft, but still will be a prick. There is a Should + have + V3 construct for this. I recommend remembering.
Note that the verb have does not change to the verb has in any person.
He should have stayed at home! “ He should have stayed home!”
I should have told you sooner. – “I needed to say earlier!”.
Maybe I should have done more. — “Perhaps I should have done more.”
This construction is used only in the past tense for a prick or regret for actions done and not done. It is not used to express future or present tense, so the second verb is used in the form of past tense, but the verb Have, as stated above, never changes.