'I invite' vs 'I'm inviting'? / 'appears' vs 'is appearing'?
Can someone explain to me why the answer to the first exercise is the letter A and to the second is the letter B , please?

Book exercise: Read each pair of sentences below, A and B. The sentence which follows each pair is related to one of the sentences in the pair. (For example, it could come after the sentence or describe the sentence.)

A: I invite everyone present to the opening of the new superstore.
B: I'm inviting everyone to the opening of the new superstore.
'I'm offering this invitation to you now'

A: The dance group appears to have arrived at the theatre.
B: The dance group is appearing at the theatre.
'There are performances every evening'

Thank you in advance!

Question

'I invite' vs 'I'm inviting'? / 'appears' vs 'is appearing'?
Can someone explain to me why the answer to the first exercise is the letter A and to the second is the letter B , please?

Book exercise: Read each pair of sentences below, A and B. The sentence which follows each pair is related to one of the sentences in the pair. (For example, it could come after the sentence or describe the sentence.)

A: I invite everyone present to the opening of the new superstore.
B: I'm inviting everyone to the opening of the new superstore.
'I'm offering this invitation to you now'

A: The dance group appears to have arrived at the theatre.
B: The dance group is appearing at the theatre.
'There are performances every evening'

Thank you in advance!

Answer

The answer to the first one is A because only A describes something that is happening right now, and only A clearly involves the speaker making the invitation to the listeners..  Sentence B could be used the same way, but is often used to talk about a PLAN to make invitations.  Example:  “Dad, I’m inviting Susan to have dinner with me.  I am going to call her later tonight and extend the invitation.”    The answer to the second one is B because only B describes an ongoing situation — the dance group is appearing at the theatre (for a number of nights).  Sentence A, in contrast, talks about a single point in time.