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Modal verbs are used to express possibilities (They might be late), obligations (I have to call my husband now), abilities (He can speak a few languages), advice (They should close the store) or permission (You may leave now). Modal verbs don't change their form according to person.
In the passive voice clauses the object of the action becomes the subject of the passive verb, i.e. James used this computer. This computer was used by James. In the active voice the focus is on the person, who does the action, and in the passive voice the focus is on the subject (the computer in the above example).
Only transitive verbs (verbs that require an object, i.e. take, buy, use) are used in the passive voice.
A defining relative clause adds an essential information to the sentence. It is not separated by commas. For example: My friends who live in the UK don't have this problem.
The information provided by a non-defining relative clause is not essential and doesn't change the meaning of the sentence. For example: My car, which is now ten years old, costed his first owner a fortune.
There are three types of phrasal verbs: intransitive (they cannot be followed by an object, i.e. turn up), transitive separable (i.e. take on) and transitive inseparable (i.e. get over).