moon7296 1. The climbers who reached the summit were exhausted. 2.
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moon72961. The climbers who reached the summit were exhausted.There's a short pause where the commas are but no change is needed in the intonation. The difference in meaning is that in sentence 2 all the climbers reached the summit, in sentence 1 only some of the climbers did.
2. The climbers, who reached the summit, were exhausted.
CliveThe John who is a linguist (no comma) was not impressed by Professor Fish's arguments.Very good, Clive!
When you say 'the John', it alerts the listener to the fact that there is more than one John in the context.
Which John? The John who is a linguist.
moon7296Professor Fish gave everyone an A which was just fine with Alice.The sentence is wrong. A comma is needed after an A because the relative clause is non-restrictive/non-defining.