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(4) 有時過去進(jìn)行時可以用來替換一般過去時,但一般過去時表示主語的行為是經(jīng)過認(rèn)真考慮的。如: He was writing his position last night. 他昨晚在寫作文。如: I was doing my lessons then. 那時,我在做功課。 Sand may be carried many miles by the wind. 風(fēng)可以把沙子帶幾里遠(yuǎn)。 The sentry is on guard. 那哨兵在擔(dān)任警戒。6. diamond n. 鉆石 diamond ring 鉆石戒指 five carat diamond 五克拉鉆石 Diamond cut diamond. 強(qiáng)中更有強(qiáng)中手。比較:wait for sth./wait for expect:心理上的等待wait for:動作上的等待 I am waiting for my mother. I expect my mother to e back.習(xí)慣用語:as one might expect 正如人們所預(yù)料的be expecting 懷孕了expect sb. to be 期望某人成為...expect sth. of sb. 對...的期望[要求]4.valuable: adj. (1) 貴重的, 珍貴的, 值錢的, 名貴的,指“由于有價值很值錢而價格高的” He has a valuable collection of stamps. 他收藏了很有價值的郵票。 An airfield is a place where aircraft can take off or land. 飛機(jī)場是飛機(jī)可以起飛或降落的地方。 The firm decided to bid on the new airfield. 該公司決定投標(biāo)爭取承建新機(jī)場。(2) 寶貴的, 有價值的, 極有用的 This is one of the most valuable lessons I learned. 這是我所學(xué)到的最寶貴的教訓(xùn)。 It was diamond cut diamond when the two teams met. 那