These and those can indeed have locative difference. They are the plural forms of this and that, respectively. They often convey a more abstract idea of proximity rather than actual physical …

Neither of these options is available. This is the traditional rule (iirc, fowler’s discusses this at length). However, in colloquial usage, either option is fine, and are … Grammatically, they are both fine. In english usage, it depends which variety of english you are talking about. In british english, there are some uses where am/is/are having is idiomatic, for example:

In english usage, it depends which variety of english you are talking about. In british english, there are some uses where am/is/are having is idiomatic, for example: