She has been practicing the piano for hours every day. Here 'has been practicing' is an example of -

♦ The scientist has been conducting experiments in the lab for weeks, collecting data for her research. Here 'has been conducting' is an example of - Verb Phrase.

• Verb Phrase:
- যে phrase - verb এর কাজ করে সেটি Verb Phrase.
-A verb phrase consists of a main verb alone, or a main verb plus any modal and/or auxiliary verbs.
- The main verb always comes last in the verb phrase
- এখানে 'has been conducting' verb এর কাজ করছে। 
- তাই এটি Verb Phrase.

• অন্যদিকে,
• Phrasal Verb:
- বাক্যে Verb + preposition/adverb থাকলে সেটা Phrasal Verb হয়।
- যেমন - look down upon, give up, look after.
- তাই এখানে Phrasal Verb (verb + preposition) হচ্ছে phrasal verb.