I’ve just wentgone to Costco with my boyfriend. I’ve just gone to Costco with my boyfriend.

I’ve just went to Costco with my boyfriend. Or I've gone to Costco with my boyfriend. I just went to Costco with my boyfriend. Or I've gone to Costco with my boyfriend.

"I" and "I've" are very similar with some overlapping uses, but have different implications particularly in tense (past, present, future). "I" implies something that happened in the past where "I've" implies something that happened in the past that continues to have an effect on the present conversation. In this case. The sentence "I've gone ..." Would be inappropriate based on the following sentence being in the present tense.

I’ve just went to Costco with my boyfriend. I just went to Costco with my boyfriend.

I’ve just went to Costco with my boyfriend. I just went to Costco with my boyfriend.

I’ve just went to Costco with my boyfriend. I just went to Costco with my boyfriend.

We’ve bought lots of household goods and foods today. We bought lots of household goods and foods today.

We’ve bought lots of household goods and foods today. We bought lots of household goods and food today.

See previous example on "I" vs "I've". Food is already plural so does not require an 's'

We’ve bought lots of household goods and foods today. We bought lots of household goods and foods today.

Removing that is optional. It doesn't matter, I just think it sounds better.

We’ve bought a lots of household goods and foods today. We’ve bought a lot of household goods and foods today.

We’ve bought lots of household goods and foods today. We bought lots of household goods and food today.

We are thinking to goabout going to a Korean BBQ restaurant tonight. We are thinking about going to a Korean BBQ restaurant tonight.

We are thinking to goabout going to a Korean BBQ restaurant tonight. We are thinking about going to a Korean BBQ restaurant tonight.

We are thinking tof going to Korean BBQ restaurant tonight. We are thinking of going to Korean BBQ restaurant tonight.

We are thinking to go to a Korean BBQ restaurant later tonight. We are thinking to go to a Korean BBQ restaurant later tonight.

You should use "a" here because there are many Korean BBQ restaurants and you weren't specific to which one you are going to.

We are thinking we will go to go to a Korean BBQ restaurant tonight. We think we will go to go to a Korean BBQ restaurant tonight.

We are thinking tof going to a Korean BBQ restaurant tonight. We are thinking of going to a Korean BBQ restaurant tonight.

I love spending time with him, just relaxing and chilling on the weekend. I love spending time with him, just relaxing and chilling on the weekend.

I love spending time with just relaxing and chilling on the weekend. I love spending time just relaxing and chilling on the weekend.

I love spending time with justjust love relaxing and chilling onduring the weekend. I just love relaxing and chilling during the weekend.

I love spending time with just relaxing and chilling on the weekend. I love spending time just relaxing and chilling on the weekend.

I love spending time withby just relaxing and chilling on the weekend. I love spending time by just relaxing and chilling on the weekend.

I love spending time with just relaxing and chilling on the weekend. I love spending time just relaxing and chilling on the weekend.

I love spending time with just relaxing and chilling on the weekend. I love spending time just relaxing and chilling on the weekend.