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Present continuous (I am doing)

some friends of mine (to be/ build) their own house, they hope to finish it next summer.
some friends of mine are building their own house. they hope to finish it next summer.

you (to be/work) hard today.
you are working hard today.

The company I work for (to be/ do) so well this year.
The company I work for isn’t doing so well this year.
The company I work ( ) isn’t doing so well this year.
The company I work for isn’t doing so well this year.

At first I didn’t like my job, but I (to be/ begin) to enjoy it now.
I didn’t like watching anime but now I (to be/ begin) to enjoy it now.
At first I didn’t like my job, but I’m beginning to enjoy it now.

I (to be/ get) a lot of messages.
I'm getting a lot of messages.

The weather (to be/ change).
The weather is changing.

The weather (to be/ get) colder.
The weather is getting colder.

The number of students (to be/ increase).
The population of the world (to be/ increase) very fast.
The number of students is increasing.
The population of the world is increasing very fast.

The price of food (to be/ rise).
*Food prices are going up.
The price of food is rising.
The temperature (to be/ fall).
Temperatures (to be/ fall).
The temperature is falling.
Temperatures are falling.
My hair (to be/ grow) really fast.
I (to be/ grow) more confident.
My hair is growing really fast.
I'm growing more confident.
My Japanese (to be/ improve).
My Japanese is improving.
It (to be/ start) to rain.
I (to be/ start) to feel tired.
It's starting to rain.
I'm starting to feel tired.
I (to be/ begin) to understand why.
I'm beginning to understand why.
Things (to be/ become) difficult.
Things are becoming difficult.