it (all)/that depends (idm) 看情况，视……而定(用于句首或单独使用)：It～s! 那要看情况!I don't know if I'll attend the party — it all～s. 我不知道我会不会去参加聚会，这要看情况。“Are you going?” “It all/That～s. “你去吗? ” “得看情况。” It～s how you tackle the problem/what the weather's like/whether you want to live better or not. 这取决于你怎样处理这个问题/天气如何/你是不是想生活得更美好。

depend on/upon(v prep) 1) 确信(vt)：I'm～ing on your coming/the weather being fine. 我相信你会来/天气会晴朗的。You may～on me to be there early/to give you the correct information. 你可以相信，我会早早到那里/给你提供正确情报的。You may～on it that it won't happen again. 你可以相信，这种事情再也不会发生了。D～on it：we won't give up. 相信吧，我们不会放弃的。2) 信任(赖)(vt)：He/The map/Their service can be～ed on. 他/这张地图/他们的服务靠得住。You can～on the train arriving on time/Tom('s) being punctual. 你可以相信，火车会准点到达/汤姆是准时的。You can～on us to vote for you/to lead you in the struggle. 你可以信赖我们，我们会投你票/领导你们斗争的。I～on you to do it/to help me. 我相信你会做这事/会帮助我。

depend on(for sth)(v prep) (一般不用prog) 1) 依靠(赖)，离不开(vt)：～on the buses/the weather forecast/one's memory 依靠公共汽车/天气预报/记忆;～on the radio for news 靠着无线电得到消息; 2) 依靠(赡养，帮助)(vt)：(children)～on their parents for food and clothes(孩子们)依赖父母提供衣食;(Smith)～on a small income for his livelihood(史密斯)依赖微薄的收入维持生计;(the poor)～on social insurance for income(穷人)依赖社会保险得到收入;The school～s on the money from the church for its survival. 这所学校依靠教会的资助维持开支。The town～s on the mining industry/tourist trade. 这城市依靠矿业/旅游业。My wife and children～on me. 我妻子和孩子依靠我生活。

depend on (v prep) (无pass)(不用prog)：视……而定，取决于(vt)：A lot/Much will～on how you do it/what happens in the next week. 这很大程度上取决于你怎么做/下周会发生什么事。It～s on my mood/your skill/a number of factors/his wishes. 这取决于我的心情/你的技艺/许多因素/他的愿望。(progress/success)～on effort and ability(进步/成功)取决于努力和能力;(price)～on quality(价格)取决于质量;(plan)～on the weather(计划)取决于天气;

→de′pendable adj 可靠的;de͵penda′bility n 可靠性;de′pendably adv 可靠地; de′pendence n 依靠(赖); 信任(赖);de′pendency n 从属国;inde′pendence n 独立;自主;de′pendant， -ent n;de′pendent adj;

【惯用法】depend 后一般都要接介词on(upon)，唯有当主语为it时，口语中这个介词常省去。试对比：What kind of a house we can offer you～s on what you are willing to pay. (我们能给你提供什么样的房子取决于你愿意付多少款。) How long should a suit like this last me? — It depends (on) how often you wear it.(这样一套衣服我能穿多久? —— 这取决于你是否常穿。)