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Eres most likely¹ comes from the 2nd person singular future active indicative of sum, eris _{("you will be")}.

Sois is comes from the Late Latin form *sutis (formed by analogy to sumus)²:

ESTIS (re-placed by *SUTIS, analogical to SUMUS) > OSp. sodes > ModSp. sois

<sup>1. On the Origin of Spanish eres, Griffin (1994)
2. The Origin of Spanish "ser": A Phonosyntactic Analysis, Joel Rini (1997)</sup>

^{Note that some other tenses of ser (future indicative, present subjunctive, conditional, imperative, infinitive, past participle, gerund) aren't related to sum at all, and are inherited from the suppletion of multiple different verbs in Latin (ire, vadere, sedere).}

Eres most likely¹ comes from the 2nd person singular future active indicative of sum, eris ("you will be").

Sois comes from the Late Latin form *sutis (formed by analogy to sumus)²:

ESTIS (re-placed by *SUTIS, analogical to SUMUS) > OSp. sodes > ModSp. sois

<sup>1. On the Origin of Spanish eres, Griffin (1994)
2. The Origin of Spanish "ser": A Phonosyntactic Analysis, Joel Rini (1997)</sup>

^{Note that some other tenses of ser (future indicative, present subjunctive, conditional, imperative, infinitive, past participle, gerund) aren't related to sum at all, and are inherited from the suppletion of multiple different verbs in Latin (ire, vadere, sedere).}

Eres most likely¹ comes from the 2nd person singular future active indicative of sum, eris _{("you will be")}.

Sois is comes from the Late Latin form *sutis (formed by analogy to sumus)²:

ESTIS (re-placed by *SUTIS, analogical to SUMUS) > OSp. sodes > ModSp. sois

<sup>1. On the Origin of Spanish eres, Griffin (1994)
2. The Origin of Spanish "ser": A Phonosyntactic Analysis, Joel Rini (1997)</sup>

Eres most likely¹ comes from the 2nd person singular future active indicative of sum, eris _{("you will be")}.

Sois is comes from the Late Latin form *sutis (formed by analogy to sumus)²:

ESTIS (re-placed by *SUTIS, analogical to SUMUS) > OSp. sodes > ModSp. sois

<sup>1. On the Origin of Spanish eres, Griffin (1994)
2. The Origin of Spanish "ser": A Phonosyntactic Analysis, Joel Rini (1997)</sup>

^{Note that some other tenses of ser (future indicative, present subjunctive, conditional, imperative, infinitive, past participle, gerund) aren't related to sum at all, and are inherited from the suppletion of multiple different verbs in Latin (ire, vadere, sedere).}

Eres most likely comes from the second-person singular future active indicative of sum, eris ("you will be"):

On the Origin of Spanish eres, Griffin (1994)

Sois is hypothesized to come from the form *sutis:

ESTIS (re-placed by *SUTIS, analogical to SUMUS) > OSp. sodes > ModSp. sois

The Origin of Spanish "ser": A Phonosyntactic Analysis, Joel Rini (1997)

Eres most likely¹ comes from the 2nd person singular future active indicative of sum, eris _{("you will be")}.

Sois is comes from the Late Latin form *sutis (formed by analogy to sumus)²:

ESTIS (re-placed by *SUTIS, analogical to SUMUS) > OSp. sodes > ModSp. sois

<sup>1. On the Origin of Spanish eres, Griffin (1994)
2. The Origin of Spanish "ser": A Phonosyntactic Analysis, Joel Rini (1997)</sup>