Hi:<br/><br/>Can you tell me it is required to add a comma ',' after adverbs-however, hence etc.?<br/><ul><br/><li>The book is expensive, however, it's worth it.</li><br/><li>She felt ill, however she came to work.</li><br/><li>She was very tired, nevertheless she kept on working.</li><br/><li>She was very tired, nevertheless, she kept on working.</li><br/><li>It is very late, hence you must go to bed.</li><br/><li>He has broken his leg, therefore, he can't walk.</li></ul>Thanks