Speak About:

Present

Past

Past to Present

Future

Abilities - Responsibilities

Asking Questions

Choosing the Right Phrase

Combining Verbs

Explaining Ideas

Describing Your World

Complex Ideas

Relating Ideas, People, Objects

Speaking about Objects

Wondering about Situations

Which Days

Days of The Week and Time Expressions

Days of the Week

Days of the week are capitalized.

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

Example:

I'm going to submit the patent on Sunday.

He applied for the patent on Friday.

When speaking about an action that is repeated every week on a specific day use the day of the week followed by 's'.

Mondays
Tuesdays
Wednesdays
Thursdays
Fridays
Saturdays
Sundays

Because of when they run inventory, it is easiest to get the products off the shelf on Mondays.

Most futures traders don't have to work on Sundays.

The Weekend

British English: at the weekend OR at weekends (in general)
American English: on the weekend OR on weekends (in general)

Example:

People like to have access to their bank account on the weekend.

The interest rate at our bank is low.

Times of the Day

These time expressions express things that happen during the day. The exception to this form is 'at night'.

in the morning
in the afternoon
in the evening
at night

Example:

The bank posts any interest rate changes in the afternoon.

Each day in the afternoon we check the pre-tax profit of all our holdings.

In / On time

'In time' expresses that something is done with sufficient time to meet a deadline.

Example:

The deferred payments were able to be paid in time last month.

The bank needs to convert the common trust fund into a mutual fund, in time to meet the tax deadline.

'On time' indicates an action that takes place at the correct, scheduled time.

Example:

The customer needs to endorse their check and mail it in on time, otherwise they will have to pay a late fee.

The check was endorsed on time.