"English is difficult."
Translation:Engels is moeilijk.
It depends on how you see it. My first laguage is Spanish, and I see English has got an easiest grammar, it is really easy. It also has got many latin words like Spanish. But Dutch pronunciation is much easier than English. Maybe you're right in this part: irregular verbs and phrasal verbs in English are are a pain in the ass for foreign people.
I was in Netherlands and I was really surprised that they were all fluent English speakers and their accent was really good. Some of them even were talking in English with each other. On the other hand it is an amazing country, I started learning Dutch when I came back from Netherlands because I simply fell in love with the country and its people.
You're write, I tell you 'cause I'm a Spanish speaker and I'm learning other languages. But, believe me, English pronunciaton is hard. It depends from which language you learn it. Imagine how hard is for Spanish speakers to get the vowel pronunciation: English has got 12 monotongue sounds, we've got only five.
Zwaar is more about mentally of physically draining, moeilijk more about intellectually challenging.
E.g een zware wedstrijd (a hard/tough match), een zware test (a hard test), het was zwaar om het boek te lezen, het duurde te lang (it was tiresome to read the book, it took too long), een zware verkiezingsstrijd (a tough election battle).
And een moeilijke test (a difficult test), het was moeilijk om het boek te lezen, ik snapte er niks van (it was difficult to read the book, I didn't understand a thing).
Also zwaar can mean physically heavy.