"working out" or "doing work out"? I know people usually call exercising or lifting weight in the gym as "workout" (or "work out?" I don't know which way it is.) What if I want to say something in "ing" form? Should I say "I'm working out." or "I'm doing the workout."? BTY, is it "workout" or "work out"?

IN or AT? "There are tigers at the zoo." I read it from a book the other day. And I wondered... Can I say "There are tigers in the zoo?" And what is the difference between them?

About tense. Which one is right? 1. Did you find any mistakes in your homework and try to correct them? 2. Did you find any mistakes in your homework and tried to correct them? I know verbs should be remaining base form after "did", but the word "try" in this sentence is a little bit far away from "did" and it's right after "and". I'm not sure which form should it be.

Which one is right? Why? Everyone is doing their job. Everyone is doing their jobs.

How to translate or understand the last sentence of this passage? wheels This tractor has big wheels. Trucks have big wheels, too. This scooter has litter wheels. Skateboards have litter wheels, too. Some wheels are big. Some wheels are litter. How are wheels the same? ------------------------------------------------ Based on the context I think it means "Why all the wheels are the same?". But it used the word "how", so it could be also meaning "In what ways that all the wheels are the same?" Or... Maybe "how are ... the same" is a fixed phrase in English? But be that as it may, how to answer that exactly?

Grammar problem. Which one is right? My favorite fruit is apple. My favorite fruit is apples. My favorite fruit are apples.

Should we teach or use contractions like "wanna" and "gotta" when we are teaching 3 to 12 year olds? I did research online and most answers are saying that we should let English learners get familiar with contractions. But they were talking about normal contractions like "I'm" or "isn't". What if the learners are kids and we were talking about informal contractions like "wanna" "shoulda" "gonna"? Should we teach them that soon? Or should we wait until they get to some point in the future? Could anyone who is English native speaker with kids-teaching experience or anyone who knows better help me with it? If you are an English native speaker, when did you learn these contractions?

"Look! A snow flakes!" say the friends. Or "says the friends"? I know if it's one person's saying, then it should be "says him" or "says he". But what if it's a group of person's saying? Should I use "say" or "says"? And by the way, should I use "says him" or "says he"??

Is there a name called "Stephan"? And what's the pronunciation of it? /stiven/ or /steven/? I know there are names called Stephen and Steven, and they are mostly the same and they pronounced the same. But I heard from a friend that there is an other name call Stephan and pronounce as /steven/ or /stefen/ instead of /stiven/. I'm not sure if it's right, so could anyone from an English language country help me about it?