Just one more doubt.

Are all alternatives possible except the last? Which is best then? Thank you.

1.I watched a new drama series and last night wat the first episode.
2.and last night they broadcast/transmitted the first episode
3.and there was the first episode last night.
4. and it was the first episode last night (wrong)
5. I'm going to the inauguration (or opening party?) of a new delicatessen shop. (What do you call the party shop owners give when opening a new shop?)

1. was the first...

2. delete "and"

3. delete "and"

4. delete "and" -- better: Last night's episode was the first one. (or you could omit "one")

5. I'm going to the grand opening of a new delicatessen.

Regarding the alternatives provided:

1. "I watched a new drama series and last night was the first episode." - This sentence is grammatically correct and conveys the meaning that the speaker watched a new drama series and the first episode was watched last night.

2. "And last night they broadcast/transmitted the first episode." - This sentence is also grammatically correct and means that the first episode of the drama series was broadcast or transmitted last night.

3. "And there was the first episode last night." - This sentence is grammatically correct, but the word choice is a bit odd. A more common way to phrase it would be "The first episode was aired last night."

4. "And it was the first episode last night." - This sentence is grammatically correct, but it sounds a bit awkward. A better way to phrase it would be "Last night was the first episode."

Out of the four alternatives, options 1, 2, and 3 are acceptable. Option 4, however, does not sound natural and is incorrect.

Moving on to the second question about the party shop owners give when opening a new shop, it is commonly referred to as an "inauguration" or "grand opening." Therefore, you can say "I'm going to the inauguration (or grand opening) of a new delicatessen shop."