First, remember when using a pronoun, you must be referring back to a noun in that sentence or the previous sentence, and there must be no 'noun-pronoun confusion'.
They brought their own food, but instead of eating it, they're letting it spoil. (Needs a sentence before this for the noun.)
There the food sat, but the family disagrees so much they're tearing each other apart rather than tear into their barbeque chicken. (they're and their refers back to family)
They're over there at the playground with their children. (Needs a sentence before this for the noun.)
A proper two-sentence would be: I looked for the family. Then, I noticed they're over there at the playground with their children.
They're travelling in their vehicle because they need to get there quickly.
you can use it in words like junk yard and junk food
You can use good in a sentence when you are describing something like a food. Example: That sandwich was good. Though when you are writing you can use better words like delicious.
Yes, this is a sentence with the words "has" and "an".
"How do you use Mesozoic era in a sentence." Is a sentence using the words.
He had not thought of that.
I use chopsticks with my food.
I had a stockpile of food.
the food was inedible
Use punchy, single-syllable words, and keep the sentence short.
You can say "I like Indian food." that's a sentence.
Which sentence is correct? How you use your words matter. Or How you use your words matters.