请教8老师 I-864 Exemption

My son (US citizen) is going to sponsor my green card petition. According to I864 instruction, I do not need to file I-864 if I have met 40 credits requirement, i.e., no sponsor necessary. Some questions and need your help to clarify.

1. Per I-864 exemption, “You have earned or can receive credit for 40 quarters of coverage under the Social Security Act (SSA).” How to understand “or can receive credit for 40 quarters” instead of "earned"? If I only earned 12 credits, and I am currently working in the US on a permanent job (with TN Visa), does that possible “future” credits will be counted to current 40 credit requirement? I doubt it but not sure, pls clarify.
2. I have worked 10 years in the US. But only 3 years show “Taxed Social Security Earnings” even though all 10 years show“Taxed Medicare Earnings” per my Social security benefit report. The reason I did not have record for 7 years because the state I worked in as a public employee in these 7 years did not participate in the federal social security program. Total 7 states nationwide did so for their public state/local employees. But I did participate in the state public employment pension program in those 7 years. Would be the work experience in the state pension program eligible to count toward the social security 40 credits requirements? Many thanks.

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• Reply -863211- ♂ (2143 bytes) () 05/27/2019 postreply 19:31:09

• thanks -BZ2019- ♂ (79 bytes) () 05/27/2019 postreply 22:24:31