Look at the highlighted verb's in exercise 1b verb meank. 1)it is very important/ necessary to do something? ( if you don't to it,well have a serious problem) have to. 2) it is not necessary to do something? (you can do it if you want). 3) it is ok to do something? ( if you do it, there is no any problem). 4)it is not ok to do something? , ( if you do it, you well have a serious problem).​

sany831    1   08.04.2019 15:58    28