Generally, the unstressed version of a vowel or diphthong is more relaxed and doesn't take the full mouth position.

通常情，重读的元音或双元音嘴唇更松，并且没有完整的口型。

Is it wasabi in here? - (with full mouth) I like it!

这里有芥末吗？- （满嘴）我喜欢！

I went to open it with my mouth full of toast.

我满嘴吐司打开它。

This is great, I said with my mouth full.

这太棒了，我满嘴说。

Phil and his daughter kept my mouth full all afternoon.

菲尔和他的女儿整个午都让我满嘴都是。

As much as you can so save it to a playlist along with some of my imitation lessons for your full mouth daily workout okay?

你们可以把它收藏到播里面，还有我的其他的模仿课程，来进行完整的每日口语训练，好吗？

Sorry. You caught me with my mouth full. I didn't expect you to see me right when I walked in the door, and I didn't mean to be rude.

抱歉。我吃东西时被你抓个正着。我没想到我一进门你就看见我了，我不是有意冒犯你的。