When should I use than?

Than is used in comparisons as a conjunction (as in "she is younger than I am") and as a preposition ("he is taller than me"). Then indicates time. It is used as an adverb ("I lived in Idaho then"), noun ("we'll have to wait until then"), and adjective ("the then-governor").

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Accordingly, who's dog or whose dog?

"Whose that dog?" is never correct. "Who's that dog?" is correct if you mean to ask who the dog is. "Who's" is a contraction of "who is". "Whose is that dog?" is correct if you mean to ask who the owner of the dog is. One may also ask who's son or whose son? The correct choice is whose. So what is the difference between whose and who's? The word whose is the possessive form of the pronoun who. It is used in questions to ask who owns something, has something, etc.

Subsequently, how do i use a?

How can I teach English to use? Try giving them the following examples: He used to work out every day. (Form: used to + base verb. Meaning: He worked out often in the past but doesn't anymore.) This machine is used to make student ID cards. (Form: use (present passive) + infinitive verb. Meaning: Making student ID cards is the machine's function.)

Does a semicolon mean or?

Most commonly, the semicolon is used between two independent clauses (i.e., clauses that could stand alone as separate sentences) when a coordinating conjunction (for, and, nor, but, or, yet, so) is omitted.