Feedback on exercise A:

The transitional devices in video clip 1 were:

and --> addition

before--> time sequence

also --> addition

in contrast --> contrast

In this clip the transitional devices are of a rather common type. And is a very common transitional device and we should avoid using it in abundance. It can be quite annoying for your listeners if every sentence begins with and. Before is a more tricky device in the sense that it can serve very many functions in a sentence: it can refer to the distant past or then it can refer to the moment just before the present. Also is a device that can be used to show both addition and time sequence. In this case it is used to show addition because the speaker adds another item. In contrast is the last transitional device in this clip and it is used to show contrast.