外教一对一培训哪家好？首选，先把英语口语培训授课模式介绍一下：

外教小班：外教小班属于比较传统的授课模式了，一般老师说得多，对话少，同学的口语水平也不一，课程难度难以符合个人水平。在去培训机构路上花费的时间成本就更不用说了。

视频授课：视频授课利用已录制好的口语视频学习，这种授课模式虽是收费最低的，但只看不练，自己练口语无人监督，无法交流沟通，根本达不到提高口语的能力。

电话授课：电话授课是近几年流行起来的新兴授课模式，利用电话或网络电话作为教学手段来对学员进行英语培训。电话授课是最直接的外教一对一口语对练，妈妈再也不用担心我找不到真正外教一对一培训了~~

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Auxiliary Verbs

助动词

You already know that verbs express action or state of being. You also know that verbs have tense, mood, and voice.

动词可以描述行为和状态，有时态、式和语态。

Sometimes, to produce the various tenses, moods, and voices of verbs, you must use auxiliary verbs, or "helping" verbs. Remember that verbs only have five forms, so the auxiliary verbs or "helping" verbs allow us to form all of the various tense, moods, and voices.

有时，想要使用动词的更多时态、式和语态，需要使用助动词。切记，动词只有五种形式，而住动词可以形成所有不同的时、态、式。

助动词怎样体现时态和语态的：

Auxiliary verbs are used to form the perfect tenses and the future tense.

助动词可以表达完成时和将来时。

Auxiliary verbs are used to form the subjective mood, and can help to add emphasis with the imperative or indicative moods.

助动词可以形成虚拟语气，在祈使语气和陈述语气中表强调。

How auxiliary verbs help with voice:

助动词怎样体现语态：

Auxiliary verbs are used to form the passive voice.

助动词可以形成被动语态。

哪些词时助动词：

“Be”的所有形式：am is are was were

“Have”的所有形式：have has had

“Do”的所有形式：do did

其他词：can could shall should will would may might must

有助动词的句子：

1) I will go to school tomorrow.

我明天去学校。(将来时)

2) Jim had cleaned before Karen came home.

Karen到家前，Jim打扫了房间。(过去完成时)

3) Uma has eaten most of her hotdog for lunch.

Uma午餐时吃了大部分热狗。(过去完成时)

4) Quinn will be going to the beach next week.

Quinn下周会去海边。(将来完成时)

5) If only I had brought my swimsuit!

要是我买了泳衣该多好!(虚拟语气)

6) Please, do ask your question now.

请现在问问题。(祈使语气)

7) Marvin did take the pencil without asking.

Marvin确实没有经过允许就拿走了铅笔。(陈述语气)

8) The coat was left on the bus.

外套落在了公交车上(被动式)