Chapter 93

I am going back to Brazil in 10 days.[10 days from now]

We arranged our next meeting for April 7.

[to be on April 7]

I will be in the office until/ till 4 o'clock. 

[I will leave the office at 4:00]

I will be in the office by 4 o'clock.

[I will arrive at the office not later than 4:00]

** Throughout

If you want to emphasize or stress that an action occupied the whole period, we often use throughout.

"It rained throughout the night." [It didn't stop raining.]

This temporary tooth will be OK for the time being.

(for now / until I get a permanent one.]

On weekday , On weekends

It was hot throughout August; we didn't have one day under 90 degrees.

The best athletes can run 100 meters in less than 10 seconds.

Picasso was born in the 19th century