often to do還是doing

　　是often to do，often后面不加doing;often 表示一般現(xiàn)在,所以要用do。often作為副詞，基本含義為“經(jīng)常”、“往往”、“常?！薄ⅰ皶r(shí)?！薄ⅰ按蠖唷?，常放于行為動(dòng)詞之前，特殊動(dòng)詞、助動(dòng)詞、情態(tài)動(dòng)詞及動(dòng)詞be之后，也可放在句末表示強(qiáng)調(diào)。

　　often

　　adv.時(shí)常;常常;往往;大多;

　　比較級(jí):more often;最高級(jí):most often

　　often作為副詞，意為經(jīng)常;往往;常常;時(shí)常;大多。例句有:

　　1、I've often wondered what happened to him.

　　我時(shí)常納悶他出了什么事。

　　2、People are often afraid of things they don't understand.

　　人往往對(duì)自己不懂的東西感到恐懼。

　　3、They often spent Christmas at Prescott Hill...

　　他們經(jīng)常在普雷斯科特山過(guò)圣誕節(jié)。

　　4、How often do you brush your teeth?...

　　你多久刷一次牙?

　　5、She's going to come back every so often...

　　她會(huì)偶爾回來(lái)的。

　　6、The disease often goes/ remains undetected for many years.

　　這種疾病經(jīng)常潛伏多年而不被察覺(jué)。

　　7、People often give very different accounts of the same event.

　　人們常常對(duì)同一件事的敘述大為不同。

　　8、Stress is often a factor in the development of long-term sickness.

　　心理壓力常常是形成長(zhǎng)期病的一個(gè)因素。

　　9、Talking to others can often help to put your own problems into perspective.

　　跟別人談?wù)勍兄谡_處置自己的問(wèn)題。

　　10、It is often helpful for teachers to shadow managers in industry.

　　教師跟隨業(yè)界的管理人員實(shí)地學(xué)習(xí)，常常會(huì)很有收獲。