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I have made up the sentences below.

(1a) This is the first video game I have ever got in my collection.

(1b) This was the first video game I have ever got in my collection.

(2a) The first seashell I have ever got is very colorful.

(2b) The first seashell I have ever got was very colorful.

(2c) The first seashell I had ever got was very colorful.

Most of my non-native English speaking friends think they are all possible except (2b). I am not sure if they are correct. Please help me. Thank you very much for all your help.

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You are writing about simple events which happened at simple points in the past, so use Simple Past tense.

(1a) This is the first video game I ever got.

(1b) This was the first video game I ever got.

(2a) The first seashell I ever got is very colourful.

(2b) The first seashell I ever got was very colourful.

(2c) The first seashell I ever got was very colourful.

Clive

Comments  
ansonguyMost of my non-native English speaking friends think they are all possible except (2b).

Nope. None are possible.

ansonguy(1a) This is the first video game I have ever got in my collection.

Wrong tense. When you say the first, you pinpoint the time. From https://www.grammarly.com/blog/present-perfect-tense/ : "The present perfect tense refers to an action or state that either occurred at an indefinite time in the past (e.g., we have talked before) or began in the past and continued to the present time (e.g., he has grown impatient over the last hour)." Not only is it technically wrong, it sounds wrong.

The rest have the same problem.

 Clive's reply was promoted to an answer.