Connectives and their levels

I have been asked to give some idea as to the levels different connectives are considered to reflect, so I have enclosed a list below;

Level 3/4

and

but

so

because

then

 .

Obviously we are aiming to get their levels beyond this point and they will be so used to using these words, they will be over-using them. Time to increase their usage, but to do that we need to make sure they have a copy of some other connectives and how to use them. Here are some they will already know but as yet, may not have absorbed into their repertoire:

Level 4/5

when

because

while

before

after

until

so

where

although

though

even if

so that

if

.

I would give them this list and suggest to them they stop using the word 'and' replacing it with something else, perhaps from this list.