English as if

← Old English *ealswā ġif (inherited)

← Old English swā ġif (mention)

← German als ob (cognate)

← English as (affix)

← English if (affix)

← Middle English as ȝif (inherited)

← Middle English alls iff (mention)

← Low German as of (cognate)

← Dutch alsof (cognate)

→ English well (link)