本課出現了許多頻率副詞, 計有seldom (很少), usually (通常), often (經常), sometimes (有時候), never (從不), always (始終) 等。頻率副詞通常使用在一般現在式中。注意這些頻率副詞在句中的位置:

a. 句中有be動詞時, 頻率副詞置於該 be 動詞之後。

例: John is always busy.

　(約翰總是很忙。)

　Chris is helpful. He is never selfish.

　(克里斯很樂於助人。他從不自私。)

　Because they live far away from here, they are sometimes late for work.

　(因為他們住的地方離這裡很遠，所以他們有時候上班會遲到。)

b. 句中有一般動詞時, 頻率副詞置於該動詞之前。

例: He usually goes to bed late.

　(他通常很晚才睡覺。)

　I seldom talk to him.

　(我很少跟他說話。)

Although Jack is often alone, he is never lonely.

= Jack is often alone, but he is never lonely.

雖然傑克經常單獨一個人, 但是他從不感寂寞。

請讀者注意下列要點:

a. although亦可用though代替, 均表『雖然』, 作副詞連接詞, 引導副詞子句, 修飾主要子句。我們因受中文文法『雖然……但是……』的影響, 而可能在英文裡亦說"although (或though) ...but...", 但這是錯誤的用法, 因為英文的文法規定兩句之間的連接詞只能有一個。although (或though) 與but均為連接詞, 若同時使用會形成錯誤的雙重連接句子結構。故若採用although (或though), 則but應予省略; 若採用but, 則although (或though) 就應省略。

例: Though he is nice, but I don't like him. (╳)

　→ Though he is nice, I don't like him. (○)

  　= He is nice, but I don't like him.

　(雖然他人不錯，但是我不喜歡他。)

b. "because...so..." (因為……所以……) 亦是錯誤的雙重連接句子結構。故若採用because時, 則不可再用so; 若採用so時, 則不可再用because。

例: Because he is nice, so we all like him. (╳)

　→ Because he is nice, we all like him. (○)

  　= He is nice, so we all like him.

　(因為他人不錯，所以我們都喜歡他。)