We do not say "Is it we are going to the zoo?"
I know what you mean. My colleagues and I faced similar problems. The only difference is, as locals, we cannot and can't afford to send our children to pre-schools meant for the expats.
The local pre-school teachers are not well-educated. If you take a look at Singapore's education system, the best do not become teachers (except the minority on teaching scolarship). Graduates who decided to join the teaching profession, are usually those who are unable to get jobs after graduation. These graduates after their training in NIE, are posted to primary schools, secondary schools and those who graduated with honours are posted to junior colleges.
Minimum qualification for pre-school teachers are GCE N'levels. In other words, most graduate parents speak and write better English than these pre-school teachers.
Sigh! We wonder if it is worth sending our children to these people at all!