1. What Do Connectives Do?
Mostly they connect two separate sentences together, but they can also connect phrases and ideas.

3. Phrases which are connectives:
For example
In addition to
Compound words which are connectives:
Afterwards
Whatever
Whenever
Single words which are connectives:
Before
Secondly
Moreover

4. Connectives can be also grouped based on what they are needed for
Connectives can be also grouped based on what they are needed for. For example:
1. Time connectives
When, while, whilst, before that, after that
He sat when the teacher asked him to sit.
2. Result connective
Therefore, hence, so, as, because, due to
Many people died due to the floods.
3. Explaining connective
for example
The students found Math tough, for example they forgot division.
4. Addition connective
and, or
I walked down the lane and to the shop.