Add a comma each sentence <u>that needs</u> one.<br/><br/>I know the underlined part can be put 'needing'<br/><br/>but I think "that needs" would be more natural in the sentence than "needing"<br/><br/>but I don't know the rule or grammar used.<br/><br/>One more example;<br/><br/>Samuel Beckett <u>directing</u> his play Waiting for Godgot in 1984.<br/><br/>Does it sound natural if "directing" is changed into "who direct"(I know it's grammatically correct but don't know if it sounds OK.