Here are my answers to a few questions that students have asked recently:
1) Is it true that "would" and "could" must not be used, as it means that an argument is not sure if we use those words?
No, this is not true. Also, it isn't really correct to say that "would" and "could" make an argument uncertain. Have a look through my writing task 2 lessons, and you'll find examples of "would" and "could" used in sentences that express clear and certain opinions.
2) How many times can we repeat a word in an essay or in a paragraph?
It really depends on the essay task. Sometimes the question contains a key word that we need to repeat throughout the essay. Look at this essay, for example, and you'll see that the word "homework" is repeated many times. My computer's dictionary has no synonyms for "homework", and I think it would be pointless to use phrases like "study done outside school" to avoid repetition. The important thing is the variety of vocabulary that I use when discussing the positives and negatives of homework, not the repetition of one key word.
3) Is it plagiarism if I copy your vocabulary ideas?
No, of course not. I didn't invent the vocabulary that I use in my essays, and the opinions that I express are never strange or unique. Even if you managed to remember a whole sentence or paragraph from one of my lessons, it would still be fine (as long as it were relevant to the question). Unless you are caught copying another candidate, looking at a "cheat sheet" or using an electronic device in the test, nobody will accuse you of cheating.