Now and in the past

In the present...

• There was computers

• There is computers

• There are computers

• There were computers

In the past...

• There isn't computers

• There wasn't computers

• There aren't computers

• There weren't computers

In the present...

• There are cars

• There aren't cars

• There was cars

• There were cars

100 years ago (in the past)...

• There aren't electric cars.

• There weren't electric cars

Today (in the present)...

• There is air pollution.

• There was air pollution

500 years ago (in the past)...

• There isn't air pollution

• There wasn't air pollution.

Yesterday...

• the weather was sunny

• the weather is sunny

• the weather are sunny

• potato

Today...

• tomato

• the weather are sunny and cold

• the weather is sunny and cold

• the weather was sunny and cold

Today...

• is my birthday

• was my birthday

• are my birthday

• were my birthday

Yesterday...

• is my birthday

• were my birthday

• are my birthday

• was my birthday