Consider the following examples: You have to be really patient if you are to go shopping in the afternoon. It must be active if it is to record the film. What is the construction in bold ...
Which of the following two constructions is correct? and why? Some of the important aims of the UNO are to promote peace and protect human rights. Some of the important aims of the UNO are ...
To me, it seems that the following subtly differ in meaning: X requires that Y have (occurred prior to blah-blah-blah) X requires that Y has (occurred prior to blah-blah-blah) Problem is, I can't ...