1. to and fro : 来回;
副词
介词
新年快乐
新年快乐
自责
介词和副词用法(PREPOSITION AND ADVERB USES)
In addition to the uses shown below, to is used in phrasal verbs such as ‘see to’ and ‘come to’. It is also used with some verbs that have two objects in order to introduce the second object.