Put the verb into the correct form, ~ing or to… .
Please leave me alone. I’m trying *** (concentrate).
I tried to keep my eyes open but I couldn’t.
Then I tried knocking on the door…
We tried to put the fire out but we were unsuccessful.
She tried asking Gerry but he was short of money too.
I tried to reach the shelf but I wasn’t tall enough.
I’m trying to concentrate.
I need to go away for a while.
She needs looking after.
They need cleaning.
Why are you leaving now? You don’t need to go yet, do you?