Both the additive sentence connectors and adjectives are unique in their ability to form links across sentences. Sentence connectors always require a comma to separate them from the grammatical subject of the sentence. It should, however, be noted that sentence connectors are an area of English grammar where little research has been done. We summarize what little research there is, and tentatively offer the following suggestions for using these between-sentence connectors.

You should keep in mind that native speakers themselves may not always follow the guidelines set out here. One thing that is clear, however, is that languages differ in the frequency and range of connectors used in writing. Finnish, for example, tends to rely on a smaller range, and does not seem to use connectors as frequently as English does. This means that Finnish-speaking readers may feel that English texts sound 'naïve', because they 'overuse' connectors, while Finnish speakers could write texts in English that may "unconnected" or even 'illogical' to English speakers.