FormArabic exampleSubject / respect / particle1زَيْدٌ كَالْأَسَدِ فِي الشَّجَاعَةِStated / stated / stated2زَيْدٌ كَالْأَسَدِStated / omitted / stated3زَيْدٌ أَسَدٌ فِي الشَّجَاعَةِStated / stated / omitted4زَيْدٌ أَسَدٌStated / omitted / omitted5كَالْأَسَدِ فِي الشَّجَاعَةِOmitted / stated / stated6كَالْأَسَدِOmitted / omitted / stated7أَسَدٌ فِي الشَّجَاعَةِOmitted / stated / omitted8أَسَدٌOmitted / omitted / omitted
The last four forms depend on a context in which the discourse is already about Zayd and the expression supplies a description of him. These illustrate structural ellipsis, not automatic similes in the absence of a relevant context.