Both than and as are used in comparisons. Than is used after adjectives and adverbs in the comparative degree. As and that are not used after comparatives.

Than is used after adjectives and adverbs in the comparative degree. As and that are not used after comparatives.

• John is taller than his brother. (NOT John is taller as his brother.) (NOT John is taller that his brother.)

As, when and while can be used to talk about actions that take place at the same time. There are some differences.

Some transitive verbs can be followed by an object together with an adjective or a noun phrase that gives more information about the object. This adjective or noun phrase that complements the object is called an object complement.

Alternately and alternatively

Alternate means ‘every second’ in turns.

We spend alternate weekends at our farm house.

Alternatively can mean ‘different’, ‘instead’ or ‘on the other hand’.

Since

As a conjunction since means ‘from and after the time when’.

Concession or contrast may be expressed in several different ways. Study the following examples carefully.

By using though and although

Note that both though and although mean the same.