Some common mistakes, and how to avoid them:

I like
Very like
I wish you have a good day
I wish I am rich
I like to play
I with my friend went to the beach
We together go
I went to the park, it was very nice
I’m so-so
The next next day
I came in the train
“You aren’t stupid, are you?” “Yes.”
District of Columbia, Washington, 1600 Pennsylvania Avenue