Answer:
1. A phrase is a group of two or more words that work together but don't form a clause.
2. a clause is a group of related words; but unlike a phrase, a clause has a subject and verb.
3. I cannot find words to express to you my displeasure. At the time she had thought he was trying to express his love. Meanwhile the desire to express myself grew. Why speak, when words cannot express what one feels?