introduce examples that support the main points/reasons (for example, these include, as shown by, for instance, such as);
add extra information to what has already been said (moreover, furthermore, another reason, in addition);
show cause and effect, (consequently, causes, leads to, brings about, results in, otherwise, since, if...then, unless)
introduce the other point of view (on the other hand).
Points are carefully linked within and between paragraphs.
Modality is used to show strength of feeling.
Verbs (should, must, may).
Emotive language is used (words that will appeal to the reader's feelings e.g concern, unreasonable).
Pronouns (I, we, us) are used to persuade the reader to agree with the position argued (We all know that smoking causes cancer so we do not smoke).
Thought provoking questions are used which may be rhetorical ie a question asked only for effect, not for information (Would you give your pre-schooler matches to play with?).
Vocabulary specific to the topic is used.
Concluding phrases are used (I would like to persuade you that... Therefore I think I have shown that...After considering the above points you must agree... In summary... These arguments show that...Therefore it can be seen that...).