Drinking ginger tea on a cold day can be a good way to start. Here the underlined part is a/an -

• Drinking ginger tea on a cold day can be a good way to start. Here the underlined part is a - gerundial phrase.

Gerundial Phrase: Verb+ing + Extension যদি Noun (Subject/ Object) এর কাজ করে তবে তাকে Gerundial Phrase বলে।
যেমন:
- Walking in the morning is good for health.
- Helping the poor is a great virtue.
- Stop telling lies.
- Cycling on the hill tracks is not easy.
- এখানে, 'Drinking ginger tea on a cold day' phrase টি বাক্যের subject বা noun এর কাজ করছে তাই এটি Gerundial Phrase.