Underline it and write the correct answer in the space provided: He shouldn't shut the windows bacause it is raining

each sentence below contains an error . underline it and write the correct answer in the space provided
1 He shouldn't shut the windows bacause it is raining
2 they are on holiday for two weeks so they will be here tomorrow
3 you should always to tell an adult where you are going
4 you may á well go home now , i won't to be back for hours