fasten sth
及物用法，后面直接接被系牢或固定的物体。
He fastened his seatbelt before the car started.
他在汽车启动前系好了安全带。
固定；系牢
关紧；扣住；(使两物)系牢( fasten的过去式和过去分词 ); 系紧; 使牢固; (使)关紧
to attach or fix something securely in position
(使两物)系牢( fasten的过去式和过去分词 ); 系紧; 使牢固; (使)关紧
imp. & p. p. of Fasten
一般现在时
She fastens her seatbelt before driving.
她开车前系好安全带。
一般过去时
He fastened the rope to the tree.
他把绳子系在树上。
现在完成时
They have fastened all the windows securely.
他们已经把所有窗户关紧了。
规则动词，过去式和过去分词同形，常与to/with连用。
The picture frame was fastened to the wall with two small nails.
画框用两颗小钉子固定在墙上。
用法提示：这里用被动语态强调画框被固定在墙上，fastened表示“固定”。
Please make sure the straps are fastened before you take off.
起飞前请确保安全带系好。
用法提示：fastened作过去分词，表示安全带被扣紧，强调“系牢”。
He fastened the leash to the dog's collar and went for a walk.
他把狗绳系在狗的项圈上，然后去散步。
用法提示：fastened作谓语动词，表示“把……系在……上”。
及物用法，后面直接接被系牢或固定的物体。
He fastened his seatbelt before the car started.
他在汽车启动前系好了安全带。
to 后面接固定的位置或目标。
She fastened the notice to the board.
她把通知固定在公告板上。
被动结构，with 引出用于固定的工具或材料。
The gate was fastened with a heavy chain.
大门被一条粗重的链子锁上了。
grammar · medium
易错句子The door is fasten.
正确表达The door is fastened.
be 动词后表示状态要用过去分词 fastened；fasten 是动词原形，不能作表语。中文“门关紧了”没有动词形态变化，容易漏掉 -ed。
grammar · medium
易错句子Please fasten seatbelt before driving.
正确表达Please fasten your seatbelt before driving.
英语可数名词单数 seatbelt 前必须有冠词、物主代词等限定词；中文名词没有这种要求，所以容易漏掉。加上 your 才明确“系好你自己的安全带”。
grammar · medium
易错句子He fastened the shelf by screws.
正确表达He fastened the shelf with screws.
表示“用某种工具或材料”时，英语用介词 with；by 通常表示方式、手段（如 by doing）或施动者，不能直接接工具名词。因此要用 with screws。
fixed 多指把某物安装或固定在某个位置，也常指修理；fastened 强调用扣、系、绑、锁等动作使东西合拢或牢靠，动作意味更强。
tied 专指用绳带打结系住；fastened 范围更广，扣纽扣、拉拉链、锁门都可用，不一定需要打结。
locked 明确指用钥匙或锁具锁上；fastened 只表示关紧、扣住，未必上锁。
Choose the next layer that will help you use fastened with more confidence.
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