Eng combos during PvP :D

So hey guys, Ive been doing a lot of pvp lately with comms and dont you hate it when they do combos lol.... so i asked my friends if engs can do combos and they said "no :(" but!! they add to the combos that comms create o.O the question is how? your opinions, thoughts down below(:

Btw, i just realized that i used the word "combos" a lot xD

There is only one self combo.
That is a com's backbreaker combo.

The combos your friends we're talking about were just skills in an order to a certain preference. Those don't make an actual combo but they are a combo of skills.