A. use either comfortable or convenient to complete the sentences. 1) it is ... seat. my body feels at ease when i'm in this armchair. 2) you can see the stage very well from this seat. it is ... . 3) the new train is very ... . it has soft seats. 4) i think the 7.15 train is the most ... . it starts at a suitable time and you don't have to change. 5) it is a very ... blouse. it feels very nice on your body. 6) it is a ... blouse. it is easy to wash and you don't have to iron it.

The following answers are based on the semantic difference between comfortable (physical ease and relaxation) and convenient (suitability for a purpose, saving effort or time).

1. It is a comfortable seat. My body feels at ease when I’m in this armchair.
2. You can see the stage very well from this seat. It is convenient.
3. The new train is very comfortable. It has soft seats.
4. I think the 7.15 train is the most convenient. It starts at a suitable time and you don’t have to change.
5. It is a very comfortable blouse. It feels very nice on your body.
6. It is a convenient blouse. It is easy to wash and you don’t have to iron it.

Explanation

• Comfortable is used when something provides physical relaxation or pleasant sensations to the body. In sentences 1, 3, and 5, the focus is on "feeling at ease," "soft seats," and "feeling nice on the body."
• Convenient is used when something is useful, well-located, or saves time and effort. In sentences 2, 4, and 6, the focus is on a "good view," a "suitable time/no transfers," and being "easy to wash/no need to iron."

You can proceed by applying these rules to other adjectives like suitable or practical to further refine your vocabulary.