When I caught him cheating,I stopped buying things there and started dealing with another shop.當(dāng)我發(fā)現(xiàn)他欺騙,我停止在那里購買東西,而開始和另一家商店打交道（或交易）.
caught him cheating：發(fā)現(xiàn)了他的欺詐（哄騙、欺騙）行為.
deal with：惠顧； 與…交易；應(yīng)付； 對(duì)待.為什么用start doing不用start to do？問：題中為什么用start doing不用start to do？答：之所以用 started dealing with 是原為“談及一項(xiàng)長(zhǎng)期活動(dòng)或開始一種習(xí)慣時(shí)，使用動(dòng)名詞形式；另一方面與“stopped buying things ”形成前后文的對(duì)照。 相關(guān)知識(shí)介紹：start to do 和start doing的區(qū)別：1、談及一項(xiàng)長(zhǎng)期活動(dòng)或開始一種習(xí)慣時(shí)，使用doing. How old were you when you first started playing the piano? 你幾歲時(shí)開始彈鋼琴？ 2、 begin, start用進(jìn)行時(shí)時(shí)，后面動(dòng)詞用不定式to do I was beginning to get angry。 我開始生起氣來。 3、在attempt, intend, begin, start 后接know, understand, realize這類動(dòng)詞時(shí)，常用不定式to do。 I begin to understand the truth。 我開始明白真相。 4、物作主語時(shí) It began to melt.