signal to sb to do sth
表示向某人发出做某事的信号，to 后接具体动作。
The coach was signaling to the players to slow down.
教练正向球员们示意，让他们放慢速度。
发信号；示意
先理解核心含义，再看它在真实句子里的用法。
发信号；示意
to communicate or send a message by means of a signal
一般现在时
She signals the driver to stop.
她向司机发出停车信号。
一般过去时
The bell signaled the end of class.
铃声标志着下课。
现在进行时
The traffic light is signaling that we can turn.
交通灯正发出信号表示我们可以转弯。
signal 为规则动词，原形为 signal；美式拼写常用 signaling/signaled，英式常作 signalling/signalled。
The police officer was signaling to the driver to pull over.
警察正示意司机靠边停车。
用法提示：这里 signaling 作动词，表示用手势或信号向某人传达指令。
She was signaling to her friend that the meeting had been canceled.
她正示意朋友会议已经取消了。
用法提示：这里 signaling 作动词，表示通过眼神或手势传达信息。
The ship was signaling for help by flashing its lights.
轮船正通过闪烁灯光发出求救信号。
用法提示：这里 signaling 作动词，表示用信号设备发出求救信息。
表示向某人发出做某事的信号，to 后接具体动作。
The coach was signaling to the players to slow down.
教练正向球员们示意，让他们放慢速度。
用 that 从句说明信号所传达的具体内容。
The flashing light is signaling that the machine is overheating.
闪烁的灯正发出信号，表明机器过热。
for 后接希望对方提供的事物或采取的行动。
She was signaling for a waiter to come over.
她正示意叫服务员过来。
表示“表明、预示”时，后面直接接所显示的事物。
The new policy is signaling a shift in priorities.
新政策正预示着优先事项的转变。
grammar · medium
易错句子The officer is signaling the drivers stop.
正确表达The officer is signaling the drivers to stop.
signal 表示“示意某人做某事”时用 signal sb to do sth，宾语后必须接带 to 的不定式；汉语“示意司机停下”没有对应的 to，不能直接跟动词原形。
grammar · medium
易错句子She is signal him to come closer.
正确表达She is signaling him to come closer.
现在进行时要用 be + 动词 -ing，signal 的 -ing 形式是 signaling；汉语动词没有这种形态变化，容易在 be 后误用原形。
grammar · medium
易错句子These results are signaling to a major change.
正确表达These results are signaling a major change.
signal 作“表明、预示”讲时是及物动词，后面直接跟所预示的内容，不加介词 to；to 只用于“向某人发信号”的接受者。
sign 多指用手势、眼神等示意某人做某事，常作 sign to sb to do sth，也可指签名；signal 强调发出明确或约定的信号来传递信息，还可表示“表明、预示”。
indicate 是及物动词，直接接宾语，语气较正式，多用于数据、迹象“表明”；signal 可作不及物动词，强调发出信号的动作，也可接 that 从句表示“预示”。
gesture 特指用身体动作（尤其手部）示意，常与 to/toward 连用；signal 不一定用身体动作，可通过声音、灯光等发出信号，且另有“表明”之义。
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