Commas in a Non-Restrictive

Is the following sentence punctuated correctly?

My doctor, who graduated from Harvard University, is very intelligent.

• Yes

• No

What is the nonrestrictive element (or nonessential piece of information) in this sentence?

Pearls which are expensive aren't something I buy very often.

• which are expensive

• pearls

• aren't something I buy very often

• There is no nonrestrictive element in this sentence.

Q. What is the parenthetical phrase in this sentence?

My mother, who had been waiting for the past 30 minutes, was beginning to question where the train was.

• My mother

• who had been waiting for the past 30 minutes

• was beginning to question

• where the train was.

What is the nonrestrictive element in this sentence?

My two brothers Kyle and Jeff are in town for Thanksgiving weekend.

• Kyle and Jeff

• My two brothers

• are in town for Thanksgiving weekend.

• There is no nonrestrictive element in this sentence.

Which answer choice correctly uses commas to set off the nonrestrictive elements in this sentence?

Europa one of Jupiter's moons is covered in ice.

• Europa, one of Jupiter's moons is covered, in ice.

• Europa one of Jupiter's, moons, is covered in ice.

• Europa, one of Jupiter's moons, is covered in ice.

Which answer choice correctly uses commas to set off the nonrestrictive elements in this sentence?

Costa Rica a small Central American country is a major coffee grower.

• Costa Rica a small, Central American, country is a major coffee grower.

• Costa Rica, a small Central American country, is a major coffee grower.

• Costa Rica, a small Central American, country is a major coffee grower.

Which answer choice correctly uses commas to set off the nonrestrictive elements in this sentence?

Nick's car a green Subaru was stolen last night.

• Nick's car a green Subaru, was stolen last, night.

• Nick's, car a green Subaru, was stolen last night.

• Nick's car, a green Subaru, was stolen last night.

What is the nonrestrictive element in this sentence?

The students read silently at the start of class.

• The students

• at the start of class

• There is no nonrestrictive element in this sentence.

• read silently

What is the nonrestrictive element in this sentence?

Ms. Smith my teacher always assigns us homework over the weekend.

• Ms. Smith

• always assigns us homework over the weekend

• my teacher

• There is no nonrestrictive element in this sentence.

Which sentence is written correctly?

• Cheesecake Factory, our favorite restaurant, has the best salmon.

• Cheesecake Factory our favorite restaurant, has the best salmon.

• Cheesecake Factory our favorite restaurant has the best salmon.