Find the mistake
communicative function
Present Simple
Present Simple or Present Continuous
Will or To be going to
100

He going to travel tomorrow morning.

Verb TO BE is missing - To BE should be in the 3rd person form: IS 

100

To talk about routines or permanent states.

Present Simple.

100

home / are / we / at

We are at home.

100

? / birthday / where / we / celebrate / his 

Present Continuous:
Where are we celebrating his birthday?

100
open / gym / exercise / we / in / morning / the / if / the

We will exercise in the morning if the gym opens. 

200

She are going to present at the conference.

She is going to present at the conference. 

200

To talk about something that is happening at the moment. 

Present Continuous.

200

birthday / visit / they / for / mom / my / her

They visit my mom for her birthday.

200

the / study / what / you / in / afternoon / ?

Present Simple: What do you study in the afternoon?

200

my / come / party / to / you / ?

Will you come to my party?

300

Maybe we will are going to wash the dog.

Maybe we will wash the dog.

300

To talk about decisions taken at the moment. 

Future Simple (Will)

300

He _______ (not / play) Xbox.

He does not play Xbox.

300

month / go / plan / she / to / London / next 

Present Continuos: She is planning to go to London next month.

300

a / buy / new / she / house

She is going to buy a new house.

400

Where will we doing tomorrow?

What will we do tomorrow?

400

To talk about plans that are very likely to happen. 

Present Continuous / To Be Going To

400

She __________ (travel) to Japan every June.

She travels to Japan every June.

400

not / they / cook / dinner / tonight 

Present Continuous: They are not cooking dinner tonight.

400

come / not / think / I / she 

I think she won't come.

500

What will is they are going to study next year?

Where will they study next year? / Where are they going to study next year?

500

To make predictions

Future Simple (will)

500

walk / morning / 5km / the / they / in

They walk 5km in the morning.

500

not / we / book / Chinesse / read /we / the

Present Simple: We don't read the Chinesse book.

500

today / not / we / finish

We won't finish today.