Present continues.
Am I costing?
Are you costing?
Is he costing?
Is she costing?
Is it costing?
Are we costing?
Are you costing?
Are they costing?
Present simple.
Do I know how much it costs?
Do you know how much it costs?
Does he know how much it costs?
Does she know how much it costs?
Does it know how much it costs?
Do we know how much it costs?
Do you know how much it costs?
Do they know how much it costs?
Past simple.
Did I know how much is cost it yesterday?
Did you know how much is cost it yesterday?
Did he know how much is cost it yesterday?
Did she know how much is cost it yesterday?
Did it know how much is cost it yesterday?
Did we know how much is cost it yesterday?
Did you know how much is cost it yesterday?
Did they know how much is cost it yesterday?
Future simple.
Will I know how much cost it'll be next month?
Will you know how much cost it'll be next month?
Will he know how much cost it'll be next month?
Will she know how much cost it'll be next month?
Will it know how much cost it'll be next month?
Will we know how much cost it'll be next month?
Will you know how much cost it'll be next month?
Will they know how much cost it'll be next month?
First conditional
(if + present simple + future simple).
If You GUESS THE PRICE, I'll BUY IT FOR YOU!
If it costs in good price I'll buy it.
Second conditional (If I were)
(if + past simple + would).
If you don't guess the price, I wouldn't buy it for you!
Present perfect.
Have I known how much cost of living in Poland in this month is?
Have you known how much cost of living in Poland in this month is?
Has he known how much cost of living in Poland in this month is?
Has she known how much cost of living in Poland in this month is?
Has it known how much cost of living in Poland in this month is?
Have we known how much cost of living in Poland in this month is?
Have you known how much cost of living in Poland in this month is?
Have they known how much cost of living in Poland in this month is?
Past continues
(was/were + present participle +ing).
It was costing 6$ yesterday evening.
Past continues (2)
(past continues + when + past simple)
It was costing 6$ yesterday evening when we had promotion.
Past continues (3)
(past continues + while + past continues)
It was costing 6$ yesterday evening while that thing was costing 4$.
