Linkers
From : http://blocs.xtec.cat/turo/2012/12/09/conectors-and-linkers/
Linkers and connectors are tremendously important in your writings. Little by little, you must incorporate them to your essays and compositions. Why don't you practise them with the exercises and documents below ?
Linkers of reason - Advanced
But, although, and, because, so, when - Elementary
Because vs. Because of - Intermediate
Although vs. In spite of - Intermediate