As a coordinating conjunction; expressing two elements to be taken together or in addition to each other. • Used simply to connect two noun phrases, adjectives or adverbs. • Simply connecting two clauses or sentences. • Introducing a clause or sentence which follows on in time or consequence from the first. • Yet; but. • Used to connect certain numbers: connecting units when they precede tens (now dated); connecting shillings to pence in a monetary quantity (now historical); connecting tens and units to hundreds, thousands etc. (now often omitted in US); to connect fractions to wholes. • Used to connect more than two elements together in a chain, sometimes to stress the number of elements. • Connecting two identical elements, with implications of continued or infinite repetition. • Introducing a parenthetical or explanatory clause. • Introducing the continuation of narration from a previous understood point; also used alone as a question: ‘and so what?’. • Used to connect two verbs where the second is dependent on the first: ‘to’. Used especially after come, go and try. • Introducing a qualitative difference between things having the same name; "as well as other". • Used to combine numbers in addition; plus (with singular or plural verb). • Expressing a condition. • If; provided that. • As if, as though. • Connecting two well-formed formulas to create a new well-formed formula that requires it to only be true when both of the two formulas are true.