Between is used to refer to two or more things which are clearly separated:

• Stand between the red lines.

Among/ amongst is used to refer to things situated more or less centrally in relation to several other things:

• There was a small cottage amongst the trees, deep in the woods.

[Amongst is UK English]

We use fewer with countable nouns and less with uncountable or mass nouns:

• We sold fewer cakes this month compared to the same time last year.
• The fewer words she says the better.
• We’ve got less money than I thought but I don’t know why.
• The less said, the better.

Less is normally used with numerals:

• She had a score of less than 100.

and with expressions of measurement or time:

• He worked here for less than two weeks.
• We live less than four miles away.

but fewer is used if the things denoted by the number are seen as individual items or units:

• There were fewer than ten candidates for the position.
  

We use:

• e.g. to mean for example
• i.e. that is to say and is used to add explanatory information or to state something in different words:

• There are many types of material from which shoes can be made e.g. leather, plastic, cotton.
• It’s a new type of shoe made from laboratory enhanced organic polymer, i.e. a synthetic leather.
  

Too means to a higher degree than is desirable, permissible, or possible; excessively; or in addition, also:

• I want to go too.

To is an infinity marker:

• I agreed to take him to the meeting.
• I need to go now or I will miss my train.

and a preposition:

• I walked down to the shops yesterday.
• We went to the train station.
  

When referring to a brand or entity, use it as using they or their can confuse:

• To keep up with their changing audience, Anderson & Cº rebranded in 2001. [confusing]
  

Their and they refer to people not a brand or entity. Therefore, when one refers to an entity rebranding, we use it:

• To keep up with its changing audience, Anderson & Cº rebranded in 2001.
  

Its is a possessive determiner to mean belonging to or associated with a thing previously mentioned or easily identified:

• We bought this house for its charm and space.

It’s is a contraction of it is:

• It’s wonderful to see you!

The confusion arises as some possessives do have apostrophes:

• The man’s house was on fire, although no-one knew who he was.
  

Your is a possessive determiner to mean belonging to or associated with the person or people that the speaker is addressing:

• Is that your car? I thought you had a black one.

You’re is a contraction of you are:

• You’re so clever!
  

When we are taking public transport and we mean to be too late to catch (a passenger vehicle or the post), we use miss:

• Hurry up! We’ll miss the train if we don’t leave now.

We use lose to mean unable to be unable to find (something or someone) or to be deprived of or cease to have or retain (something):

• I’ve lost my car keys. I thought they were in this drawer.
• After the meeting, George had lost his appetite.
  
• Did we gain or lose the contract? Do we know, yet?

Our online courses and modules are designed with you in mind:

• flexible: you have busy lives, so our courses fit your schedule
• practical: we use everyday examples and situations to help you understand
• practice: there is only one way to improve; mistakes are there to help us learn
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Our online module How to avoid common mistakes takes you through the most common mistakes and how to avoid them:

Their is a possessive determiner and there is an adverb. They can be confused because they are pronounced the same:

• This is their house.
  
• There it is! That’s our hotel. The one with a clock tower.

Modal verbs are never followed by to, except ought to:

• I must go now. [obligation]
• We should sell the company cars. [desirable]
• I will arrive at 11.
• We ought to order our food now.

This rule does not apply to those words or phrases which act like model verbs:

• We are able to come to the meeting.
• We can come to the meeting.

Ought to is formal and you can use must [obligation, duty or correctness] or should [desirable] instead:

• I ought to go now. [obligation]
• We ought to sell the company cars. [desirable]

When we talk about age, height, weight, size and colour, we also use be:

• I am hungry.
• I feel very tired.
  
• I feel a bit nervous about the presentation tomorrow.
  
• I’m afraid we don’t have enough money.
• She’s under twenty which is a little young.
• He’s mature for his age.