A conjunction, also called a connecting word, is a word used to connect words, phrases, clauses and sentences.
|O livro e a caneta estão na mesa.||The book and the pen are on the table.|
|Eu acho que ele está doente.||I think that he is sick.|
|Você prefere café ou chá?||Do you prefer coffee or tea?|
Remark: In Portuguese the conjunction que (that) is more frequently used than in English.
In sentences like Ele acha/sabe/disse que…. (He thinks/knows/said that….) the conjunction que (that) cannot be omitted.