i enjoy playing  tennis

میں ٹینس کھیل کر لطف اندوز ہوتا ہوں۔

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• If I have money, I Will purchase it tomorrow
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• We use will: to express beliefs about the present or future. to talk about what people want to do or are willing to do.

This is a conditional sentence.

We use subject + past tense in first clause, subject + would + first form of verb in such type of sentences.

If I had money, I would purchase it now.

Here too is working as a preposition.

Nuclear energy is too dangerous to be used widely means جوہری توانائی کا وسیع پیمانے پر استعمال کے لیے بہت خطرناک ہے

Here too means as well.

Second form of verb is always used with in a sentence of past indefinite tense.

Walk, walked, walked

Either or means یا تو یہ یا تو وہ

We generally use in after succeed.

In is a preposition here.

Succeed in something means کسی کام میں کامیاب ہونا

We need to find another method. 

Here another is a pronoun.

Another means ایک اور