In English, future tense sentence can be formed using the “going to” phrase.
“He will come?” can also be said as “He is going to come”

In Marathi this sentence is formed as
Subject         verb+णार         form of असणे(“asaNe”)in present tense
तो                   येणार                 आहे

Question will be formed as
Subject        verb+णार          form of असणे(“asaNe”)in present tense      का ?
तो                  येणार                   आहे का ?

Examples

English
Marathi
They are going to come
ते येणार आहेत (te yeNAr Ahet )
I am going to speak
मी बोलणार आहे (mI bolaNAr Ahe )
She is going to open door
ती दार उघडणार आहे (tI dAr ughaDaNAr Ahe )
You are going to dance
तू नाचणार आहेस (tU nAchaNAr Ahes kA)
Are they going to come
ते येणार आहेत का (te yeNAr Ahet kA )
Am I going to speak
मी बोलणार आहे का (mI bolaNAr Ahe kA)
Is she going to open door
ती दार उघडणार आहे का (tI dAr ughaDaNAr Ahe kA )
Are you going to dance
तू नाचणार आहेस का (tU nAchaNAr Ahes kA )

Listen examples in this lesson at