at first i didn't understand the meaning of the words改成同义句

i didn't catch the first bus today 同义句 英语同义句改写1.what is the meaning of the word2.my brother didn't 连词成句 word,i,the,of,understand,meaning,don't,the First at all,I couldn't get the right.or know the meaning of I can understand the words' meaning什么意思 i don't know the meanings 还是meaning of these words.meaning到底 Sorry, I didn't understand what you said .改成同义句 I didn't know the man at all同义句I ()know the man ()()() I didn’t catch the first train to London.改为同义句 He didn't like the color of the hat at all(改为同义句) he didn't like the color of the bag at all（改为同义句） I can`t understand the sentence,because the meaning of this