@chris-richards I agree with you it was all clear and logical. The main thing the teacher could improve would be to use a different search function. Using the search functions Word and Phrase shows the frequencies of specific forms e.g. go up, and it does not include other inflections i.e. goes/going/went/gone up. If we are interested in the frequency of the words regardless of form, we need to use Lemma. Notice how results differ:
Of course, the main point is the same – phrasal verbs are not as frequent, apart from carry out.
If you are coming late into the task, feel free to suggest how you would adapt task 1A.