Grammar

We always use a relative clause beginning with whose + noun, particularly in written English, when we talk about something belonging to or associated with a person. Compare: Example(1): Stevenson is an architect. Her designs have won international praise. Example(1): Stevenson is an architect (whose) designs have won international praise. Example(2): Dr Rowan has had to do all his own typing. His secretary resigned two weeks ago. Example(2): Dr Rowan, (whose) secretary resigned two weeks ago, has had to all his own typing.
We can use 'whose' in both defining and non defining relative clauses. We sometimes use 'whose' when we are talking about things, in particular when we are talking about towns or countries, and organizations: Example: The film was made in Botswana, (whose) wildlife parks are larger than those in Kenya. Example: We need to learn from companies (whose) trading is more healthy than our own. Example: The newspaper is owned by the Mearson Group, (whose) chairman is Sir ...

In formal styles, we often put a preposition before the relative pronouns which and whom: Example: The rate (at which) a material heats up depends on its chemical composition. Example: In the novel by Peters, (on which) the film is based, the main character is a teenager. Example: An actor (with whom) Gels on had previously worked contacted him about the role. Example: Her many friends, (among whom) I like to be considered, gave her encouragement.
Notice that after a preposition you can't use 'who' instead of 'whom', and you can't use 'that' or 'zero relative pronoun': Example: Is it right that politicians should make important decisions without consulting the public to (whom) they are accountable? (not... the public to who they are accountable.) Example: The valley (in which) the town lies is heavily polluted (not The valley in that the town... )
In informal English, we usually put the preposition later in the relative clause rather than at the beginning: Example: The office (which) ...

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Common Rules That You Must Keep In Your Mind -
You must use a free online grammar checker to make your text errors free. Here, some of the most common mistakes have cited below.
1. Homophones -
They are words that hold different meaning, but sound the same. Before using them, you must come across ...