... a W, it means we feel it is formal enough to use in your writing tasks. All the idioms in our list can be used on the speaking tasks, but if they do not have the W, we consider them a bit less ... metaphors. Learning some key idioms and their usages can help your score in IELTS writing and speaking tasks. It is suggested you not use about 2 idioms in an essay with 250 words. However, this ... understand it and can use it properly. This is easier when writing and idiom than when speaking it. If using it in a speaking task, you should be able to use it with the proper inflection (pitch, tone,...