In English, the verb we use in a sentence depends on its subject. How the verb changes is called a conjugation.
There are six object 'persons'.
I am British.
I speak English.
You are British.
You speak English.
He is British.
He speaks English.
She is British.
She speaks English.
It is British.
It speaks English.
We are British.
We speak English.
You are British.
You speak English.
They are British.
They speak English.
Now choose the correct verb conjugations and pay attention to tenses: