I really need to squeeze my energy to conduct all classes according to my plan. /as my plan does. / as I planned.

how to say

I have to use my energy all..? 用 英語 (美國) 要怎麼說？

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“I have to use all my energy” is perfect! “I have to spend all my energy” is also a common phrase that’s close to the feeling of your first sentence.

“I really need use all my energy to conduct my classes as I planned.”
“I really need to spend all my energy to conduct my classes as I planned.”

You could also say:

“I really need to squeeze out the last of my energy to conduct my classes as I planned.”