Isn't the "worlds" in this case a posssessive noun: "According to the World Economic Forum, the worlds three most populous cities in 2016". Like the cities of the world?

Yes, it is, and should have an apostrophe because of that. I don't know why the example sentence doesn't have an apostrophe in "worlds", but you can go to ask a question and click "report a mistake", and perhaps you might get more info.

Isn't the second question supposed to be "avoid sugary drinks every day," to maintain parallelism? the other two items in the list end in a different fashion, so i thought that was grammatically incorrect.

Parallelism isn't a grammatical rule and it's perfectly fine for it to be violated. Instead, it is a widely followed style choice. So it's not grammatically incorrect. It would be off-putting, but it's not impossible to not be parallel. Perhaps the author believed that using the "-ing" form of the verbs was enough parallelism for him.

what is the difference between its,it's and its'

Khan Academy's Grammar course actually has a video on that topic, so you could search for that if it would help you more. "Its" is a possessive pronoun. You can remember that this is the version without any apostrophe because none of the possessive pronouns (my, their, her, your, etc.) use apostrophes. You'd use this word in a sentence like: "When I was looking for my bike, I found that someone had cut *its* lock." "It's" is a contraction. It basically compresses the words "it is", so you use it when the sentence would still make sense if you substituted "it is". You can remember where to put the apostrophe because we always add an apostrophe where we remove letters in a contraction. "Its'" is not a word, and we never use it.

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SAT

Unit 11: Lesson 3

Writing: Grammar

Lists and punctuation | Quick guide

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Vlada K
Posted 2 years ago. Direct link to Vlada K's post “Isn't the "worlds" in thi...”
Isn't the "worlds" in this case a posssessive noun: "According to the World Economic Forum, the worlds three most populous cities in 2016". Like the cities of the world?
(5 votes)
Answer
- Hecretary Bird
  Posted 2 years ago. Direct link to Hecretary Bird's post “Yes, it is, and should ha...”
  Yes, it is, and should have an apostrophe because of that. I don't know why the example sentence doesn't have an apostrophe in "worlds", but you can go to ask a question and click "report a mistake", and perhaps you might get more info.
  (3 votes)
Ramen23
Posted 2 years ago. Direct link to Ramen23's post “Isn't the second question...”
Isn't the second question supposed to be "avoid sugary drinks every day," to maintain parallelism? the other two items in the list end in a different fashion, so i thought that was grammatically incorrect.
(1 vote)
Answer
- Hecretary Bird
  Posted 2 years ago. Direct link to Hecretary Bird's post “Parallelism isn't a gramm...”
  Parallelism isn't a grammatical rule and it's perfectly fine for it to be violated. Instead, it is a widely followed style choice. So it's not grammatically incorrect. It would be off-putting, but it's not impossible to not be parallel. Perhaps the author believed that using the "-ing" form of the verbs was enough parallelism for him.
  (3 votes)
leticiaada60
Posted 5 months ago. Direct link to leticiaada60's post “How do you know when to u...”
How do you know when to use the semicolon
(1 vote)
Answer
koshyjoicy
Posted 5 months ago. Direct link to koshyjoicy's post “what is the difference be...”
what is the difference between its,it's and its'
(1 vote)
Answer
- Johanna
  Posted 5 months ago. Direct link to Johanna's post “Khan Academy's Grammar co...”
  Khan Academy's Grammar course actually has a video on that topic, so you could search for that if it would help you more.
  
  "Its" is a possessive pronoun. You can remember that this is the version without any apostrophe because none of the possessive pronouns (my, their, her, your, etc.) use apostrophes. You'd use this word in a sentence like: "When I was looking for my bike, I found that someone had cut its lock."
  
  "It's" is a contraction. It basically compresses the words "it is", so you use it when the sentence would still make sense if you substituted "it is". You can remember where to put the apostrophe because we always add an apostrophe where we remove letters in a contraction.
  
  "Its'" is not a word, and we never use it.
  (2 votes)
LiyaT
Posted 3 months ago. Direct link to LiyaT's post “so do just take a Punctua...”
so do just take a Punctuation is required to separate items in a list of three or more. No punctuation is needed for a list of two.
(1 vote)
Answer
- Hecretary Bird
  Posted 3 months ago. Direct link to Hecretary Bird's post “You're right! We use comm...”
  You're right! We use commas to separate items that are in lists of 3 or more. For example, if you had 3 favorite foods you could say "My favorite foods are ice cream, turkey sandwiches, and cheesecake".
  For lists of 2, all you need to connect items is "and". You would then say "My favorite foods are ice cream and turkey sandwiches".
  (1 vote)
odinakaudeozo
Posted 6 months ago. Direct link to odinakaudeozo's post “I’m still confused about ...”
I’m still confused about strong support
(1 vote)
Answer