I'd be inquiring you'd be inquiring he'd be inquiring we'd be inquiring you'd be inquiring they'd be inquiring
Perfect
I should've inquired you should've inquired he should've inquired we should've inquired you should've inquired they should've inquired
V-ing perfect
I should've been inquiring you should've been inquiring he should've been inquiring we should've been inquiring you should've been inquiring they should've been inquiring
Negation
Simple form
I shouldn't inquire you shouldn't inquire he shouldn't inquire we shouldn't inquire you shouldn't inquire they shouldn't inquire
V-ing form
I shouldn't be inquiring you shouldn't be inquiring he shouldn't be inquiring we shouldn't be inquiring you shouldn't be inquiring they shouldn't be inquiring
Perfect
I shouldn't have inquired you shouldn't have inquired he shouldn't have inquired we shouldn't have inquired you shouldn't have inquired they shouldn't have inquired
V-ing perfect
I shouldn't have been inquiring you shouldn't have been inquiring he shouldn't have been inquiring we shouldn't have been inquiring you shouldn't have been inquiring they shouldn't have been inquiring
Interrogative form
Simple form
should I inquire? should you inquire? should he inquire? should we inquire? should you inquire? should they inquire?
V-ing form
should I be inquiring? should you be inquiring? should he be inquiring? should we be inquiring? should you be inquiring? should they be inquiring?
Perfect
should I have inquired? should you have inquired? should he have inquired? should we have inquired? should you have inquired? should they have inquired?
V-ing perfect
should I have been inquiring? should you have been inquiring? should he have been inquiring? should we have been inquiring? should you have been inquiring? should they have been inquiring?
Interro-negative form
Simple form
shouldn't I inquire? shouldn't you inquire? shouldn't he inquire? shouldn't we inquire? shouldn't you inquire? shouldn't they inquire?
V-ing form
shouldn't I be inquiring? shouldn't you be inquiring? shouldn't he be inquiring? shouldn't we be inquiring? shouldn't you be inquiring? shouldn't they be inquiring?
Perfect
shouldn't I have inquired? shouldn't you have inquired? shouldn't he have inquired? shouldn't we have inquired? shouldn't you have inquired? shouldn't they have inquired?
V-ing perfect
shouldn't I have been inquiring? shouldn't you have been inquiring? shouldn't he have been inquiring? shouldn't we have been inquiring? shouldn't you have been inquiring? shouldn't they have been inquiring?