You are welcome to answer questions posted in the Ask a Teacher forum as long as your suggestions, help, and advice reflect a good understanding of the English language. If you are not a teacher, you will need to state that clearly at the top of your post. Please note, all posts are moderated by our in-house language experts, so make sure your suggestions, help, and advice house the kind of information an international language teacher would offer. If not, and your posts do not contribute to the topic in a positive way, they will be subject to deletion.
Here's a good rule of thumb. When that functions as a conjunction, look at the length of the phase that comes before. If that phrase is long, don't omit that as its presence helps the reader/listener navigate the syntax with much more ease.
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Advice please on "advise" 
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