felly - so , therefore
Conjunctions are linking words e.g. and , but , because , or. They are used to connect clauses or sentences to form more complex sentences. e.g. 'I want to go out tomorrow but it is going to rain all day.' Many Welsh conjunctions take a particular construction ( ' i' or ' bod' ) to link them with what follows in the sentence.
Felly takes neither the 'i' or 'bod' constructions and is used much as it is in English.
see: How do conjunctions work in Welsh? for more details.