【Mark Tsai】評論

https://goo.gl/sE6AqkComma Before Which in Nonrestrictive PhrasesA nonrestrictive phrase adds a little bit of extra (but not essential) information about a noun phrase that you’ve already mentioned in your sentence.Jeff’s new car, which is less than a month old, already started leaking oil.In the sentence above, which introduces a nonrestrictive phrase (highlighted in gray). Therefore, you need a comma before which and another one at the end of the nonrestrictive phrase. How can you tell that it’s a nonrestrictive phrase? Try taking it out of the sentence.Jeff’s new car already s...