anxious (adj) 焦虑的
He is anxious.
After the test, I was anxious.
They are anxious.
Good!

strays (v) 偏离的
The original form of the word is {stray}.

Every time he write essay, He strays the topic.
{He} is the third person singular, so we add an -s at the end of {write}.
{Essay} is a countable noun, so please use an article here.
And the letter {H} should be capitalized here.
Every time he writes an essay, he strays the topic.

I strays the destination.
{I} is the first person singular, so the verb should be in the original form.
I stray the destination.

They strays where they are ???
{They} is the third person plural, so the verb should be in the original form.
And watch your handwriting.
They stray where they are.