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

Ability, Admission and Advice

Basic Modals

Modals verbs modify principal verbs to express various degrees of modality such as necessity, permission, etc. . The most common modals are:

Can
Should

He can sell it online as well as in a bricks and mortar store.

You should pay more attention to the voting share.

Modal verbs remain in base form for all subjects.

Positive Form:

Subject + Modal + Verb + objects

He can sell it online as well as in a bricks and mortar store.

You should pay more attention to the voting share.

Negative Form:

Subject + Modal + Not + Verb + objects

When can we depreciate the value of our investment for tax credits?

Your account history should not be in the red.

Question Form:

Modal + Subject + Verb + objects

Can the bank refund the cancelled check fee?

Should I ask for more than the value at market price?

Can for Ability and Permission

'Can' is used to speak about abilities as well as asking for or giving permission.

Giving Advice with Should

Use 'Should' to ask for or give advice or suggestions.

Ought to, Had Better

'Ought to' and 'had better' express the same idea as 'should'. Although not as common as 'should' both these forms can be used in place of 'should'.

Example:

John ought to take a look at the income statement.

We had better find a new stockbroker.

NOTE: 'had better' is a more urgent form.