They waved goodbye and promised to play again soon.

Meaning: The boy and the girl said goodbye to each other and agreed to play catch again soon.

Choice of Words: Waved is a verb that means to move your hand or arm back and forth as a greeting or farewell. Goodbye is a word used to say farewell to someone. Promised is a verb that means to say or assure that something will happen. Play is a verb that means to take part in a game or activity. Again is an adverb that means once more.

Alternative Expressions

Related Expressions