What is normally used when there is one answer wanted, eg what is the time or what do you want for lunch. Which is normally used when there is a choice of answers,and the person asking the question gives examples, ie eg. which cereal do you want for breakfast - Cornflakes or Wheatbix.
You should use the word "I" when it is the subject of a sentence, and the word "me" when it is the object of a sentence or of a preposition. "I want you to understand me." "I want you to listen to me."
One should never use an apostrophe for the word that.One should always use an apostrophe for the word that's, meaning that is.
You should use "a" before the word hope.
You should use the word had because if its past you would say i had this not I have this because it is not the past but the persent.
This needs to have a word daaa.
If you are using the word an after a word with a vowel than go for it.
myself
no
There is no past tense for the word left. You can use already left for it.
The word "should" be used in the conditional sentences.
You can use should in past tense to say;Should haveShould not have (shouldn't)
there is no restriction. Should I .... should he .....