"STRUNK" - читать интересную книгу автора (Strunk William)

is indefensible.

Non-restrictive relative clauses are, in accordance with this rule, set off by
commas.

The audience, which had at first been indifferent, became more and more
interested.

Similar clauses introduced by where and when are similarly punctuated.

In 1769, when Napoleon was born, Corsica had but recently been acquired by
France.
Nether Stowey, where Coleridge wrote The Rime of the Ancient Mariner, is a few
miles from Bridgewater.

In these sentences the clauses introduced by which, when, and where are
non-restrictive; they do not limit the application of the words on which they
depend, but add, parenthetically, statements supplementing those in the
principal clauses. Each sentence is a combination of two statements which
might have been made independently.

The audience was at first indifferent. Later it became more and more interested.

Napoleon was born in 1769. At that time Corsica had but recently been acquired
by France.

Coleridge wrote The Rime of the Ancient Mariner at Nether Stowey. Nether
Stowey is only a few miles from Bridgewater.

Restrictive relative clauses are not set off by commas.

The candidate who best meets these requirements will obtain the place.

In this sentence the relative clause restricts the application of the word
candidate to a single person. Unlike those above, the sentence cannot be split
into two independent statements.

etc. and jr. are always preceded by a comma, and except at the end of a
sentence, followed by one.

4, 5, 6, 7, 16, and 18 should afford sufficient guidance.

If a parenthetic expression is preceded by a conjunction, place the first
comma before the conjunction, not after it.

He saw us coming, and unaware that we had learned of his treachery, greeted us
with a smile.

Place a comma before and or but introducing an independent clause.