大學英語四級考試高頻詞匯精選精學課程第1講
詞匯、語法的掌握是應對大學英語四六級考試的基礎，英語常用到的詞匯，為備戰英語四六級做準備。
It be essential that 后面一定用虛擬語氣，且句子謂語動詞固定為 + 動詞原型;
It was essential that the applications forms send back before the deadline.
53. We _D_ our breakfast when an old man came to the door.
A just have had B have just had C just had D had just had
when 還可以表示①剛..就 、②恰在此時;
44. I had just started back for the house to change my clothes _D_ I heard voices.
A as B while C after D when
45. I felt somewhat disappointed and was about to leave, _C_ something occurred which attracted my attention.
A unless B until C when D while
64. It was essential that these application forms _D_ back as early as possible.
A must be sent B will be sent C are sent D be sent
非謂語動詞與獨立主格：短語，句子
1.當短語部分有獨立主語，并且該主語不同于句子主語，這時短語結構稱為獨立主格。。
獨立主格的結構1：名詞+ 分詞
現在分詞表示主動的，正在進行的行為;過去分詞表示被動的，已經完成的行為。 作題時要通過判斷動作與名詞之間的關系來確定是使用現在分詞還是過去分詞。當動作由名詞發出時使用現在分詞，而名詞是受動者時則用過去分詞。
54. Silver is the best conductor of electricity, copper _B_ it closely.
A followed B following C to follow D being followed
49. All things _A_, the planned trip will have to be called off.
A considered B be considered C considering D having considered
call off 取消; cancel vt. 取消; 四級中的考點就是現在分詞和過去分詞的區別。
獨立主格的結構2：with + 名詞+ 分詞
36. After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys _C_ to go to school.
A to be encouraged B been encouraged C being encouraged D be encouraged
as well as 和; be encouraged不會考。
動詞不定式有預示將來行為的含義。to be encouraged 將要被鼓勵;
been encouraged 已經被鼓勵完了，與主句的謂語動詞相對;being encouraged 正在被鼓勵
2.短語部分沒有獨立主語，則短語結構稱為非謂語動詞。
非謂語動詞的結構：分詞
句子的主語決定非謂語動詞中的分詞是用主動還是被動形式。如果是句子的主語發出動作，則使用現在分詞;如果動作不是由句子的主語發出，則使用過去分詞。
詞匯、語法的掌握是應對大學英語四六級考試的基礎，英語常用到的詞匯，為備戰英語四六級做準備。
It be essential that 后面一定用虛擬語氣，且句子謂語動詞固定為 + 動詞原型;
It was essential that the applications forms send back before the deadline.
53. We _D_ our breakfast when an old man came to the door.
A just have had B have just had C just had D had just had
when 還可以表示①剛..就 、②恰在此時;
44. I had just started back for the house to change my clothes _D_ I heard voices.
A as B while C after D when
45. I felt somewhat disappointed and was about to leave, _C_ something occurred which attracted my attention.
A unless B until C when D while
64. It was essential that these application forms _D_ back as early as possible.
A must be sent B will be sent C are sent D be sent
非謂語動詞與獨立主格：短語，句子
1.當短語部分有獨立主語，并且該主語不同于句子主語，這時短語結構稱為獨立主格。。
獨立主格的結構1：名詞+ 分詞
現在分詞表示主動的，正在進行的行為;過去分詞表示被動的，已經完成的行為。 作題時要通過判斷動作與名詞之間的關系來確定是使用現在分詞還是過去分詞。當動作由名詞發出時使用現在分詞，而名詞是受動者時則用過去分詞。
54. Silver is the best conductor of electricity, copper _B_ it closely.
A followed B following C to follow D being followed
49. All things _A_, the planned trip will have to be called off.
A considered B be considered C considering D having considered
call off 取消; cancel vt. 取消; 四級中的考點就是現在分詞和過去分詞的區別。
獨立主格的結構2：with + 名詞+ 分詞
36. After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys _C_ to go to school.
A to be encouraged B been encouraged C being encouraged D be encouraged
as well as 和; be encouraged不會考。
動詞不定式有預示將來行為的含義。to be encouraged 將要被鼓勵;
been encouraged 已經被鼓勵完了，與主句的謂語動詞相對;being encouraged 正在被鼓勵
2.短語部分沒有獨立主語，則短語結構稱為非謂語動詞。
非謂語動詞的結構：分詞
句子的主語決定非謂語動詞中的分詞是用主動還是被動形式。如果是句子的主語發出動作，則使用現在分詞;如果動作不是由句子的主語發出，則使用過去分詞。
