if;in case;in the event that;be it that ;

" If it proves very effective, I'll certainly make a copy of the letter for you.
“ 假使这封信去了效果很好, 我一定把稿子抄给你看.
来源:汉英文学 - 围城Imagine what it would be like if that older brother or sister was famous.
假使您那位哥哥或姐姐很有名,想像一下状况会是如何.
来源:常春藤生活英语杂志-2006年4月号If you have finished reading that book, take it back to the library.
假使你已看完那本书, 便将它还回图书馆.
来源:《现代汉英综合大词典》
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