[Grammar] Don't and doesn't; Past tense and past participle

[Tepal]

Are these correct?
.
"They speak English."
"They don't speak English."
.
"He speaks English."
"He doesn't speak English."
.
Why is there no 's' at the end of 'speak'? Someone explain?
.
.
.
Are these correct? Because they sound weird to me...
Examples:
"The bird is flown."
"The bird has flown."

These sound correct to me:
"The smoke is risen."
"The stove is heated."
"The smoke has risen."
"The risen smoke."
"The smoke rose."
.
.
.
Thanks...

 

[bhaisahab]

Are these correct?
.
"They speak English."
"They don't speak English."
.
"He speaks English."
"He doesn't speak English."
.
Why is there no 's' at the end of 'speak'? Someone explain?
.
.
.
Are these correct? Because they sound weird to me...
Examples:
"The bird is flown."
"The bird has flown."

These sound correct to me:
"The smoke is risen."
"The stove is heated."
"The smoke has risen."
"The risen smoke."
"The smoke rose."
.
.
.
Thanks...

They speak English."
"They don't speak English."
.
"He speaks English."
"He doesn't speak English."
.
Why is there no 's' at the end of 'speak'? Someone explain?
There is no "s" because when we use the auxiliaries "don't" and "doesn't" the verb stays in the bare infinitive.
"The bird is flown."
"The bird has flown."
These are both correct.

 

[jinualex]

What is the negative form of 'said' ?

Is it
'not said' or 'didn't say'.

He not said that. or
He didn't say that.

Which is true ?

 

[philadelphia]

What is the negative form of 'said'?

He not said that.
He didn't say that.

Which is correct?

Welcome to UsingEnglish! Not a teacher.

"He didn't say that" is correct while "He not said" is not.