True, there are trade-offs. English's loss of inflected verb tenses gave rise to periphrastic constructions, which btw, Greek is moving towards, losing its inflections.
Greek started losing its inflections about 2,500 years ago (starting, perhaps, with the dual). By the time we get to koine/hellenistic Greek, although we don't see much of an increase in variation and types of periphrastic constructions, grammatical changes (e.g., the steady disappearence of the optative) increased the use. Greek is among the more fascinating languages when it comes to linguistic change (grammaticalization, grammatical vs. lexical semantic content, etc.). There's an intereseting book
The Future in Greek: From Ancient to Medieval which is devoted to periphrasis in future constructions beginning in the 5th century.
Russian is losing some also.
I wouldn't know, alas. I have studied it (but it is on my to-do list!).
English periphrastic constructions can be a nightmare, I grant: "I would have liked to have gone"; "I would like to have gone"; "I would have liked to go".
All of them are intelligible, but a bit overdone.
It's true that many common non-"bogus" grammatical errors (i.e., those that, unlike the OPs examples, really are "errors") stem from the reliance on phrasal or lexical constructions where another language may use affixation, morphology, or both. On the other hand, English verbal periphrasis makes it much easier to convey certain nuances. In English (thanks to grammaticalization and in part lexical bleaching), periphrastic present constructions include "I do study", "I study", & "I am studying" as basic present "tenses" (emphatic, simple, and progressive). And that's just the present. For the future, not only do we have "will study" but also the "immediate future" as in French: "I'm going to study". And then there are the perfect periphrastics use refer to.
So it can make for quite a mess, but on the other hand, take a look at areference Grammar for classical greek, sanskrit, or latin. In the section on verbal morphology, you'll find pages and pages of how a single verb can appear in hundreds of different ways, and yet cannot convey the nuances English can through its periphrastic Tense-Aspect-Mood system.
My partner consistently uses the pluperfect instead of the simple past, which drives me nuts: "I had wanted to go to the mall today" v. I wanted to go to the mall today". The pluperfect indicates an action previous to another action. It's not improper, because some unknown thing took place precluding him from going to the mall.
"I had wanted/intended/meant/etc. to do X" isn't actually a pluperfect but a counterfactual conditional.
There's a theory afoot that Germanic is not even Indo-European because it has some features that are un-Indo-European.
Could you provide a reference? Because whomever informed you (whether in person or through a book or whatever) is making a fantastically unbelievable claim. Comparative linguistics and the creation of Indo-European linguistics began in Germany with guys like Grimm, Bopp, Brugmann, Delbrück, Schleicher, etc. It's been over a century since
Grundriss der vergleichenden Grammatik der indogermanischen Sprachen volumes were published. And since then, we've increased our knowledge of IE through the discovery and/or translation of Linear B, Tocharian, Hittite, etc. Ringe's book From
Proto-Indo-European to Proto-Germanic (Oxford University Press, 2006) is devoted entirely to the shifts in IE which gave rise to proto-Germanic.
So I would love to know who is saying that Germanic languages are not IE languages and why they think so.
One linguist, Joseph F. Foster, Ph.D. (I don't know if he passed away, he doesn't participate in the Linguist List panel anymore) used to say that if Germanic is IE, they spoke it with one hell of an accent.
I don't follow. Every IE language group is defined in a major why by the sound changes in that group which differentiate it from others. That's actually a major method for reconstrcuting PIE: tracking the sound changes unique to language families and those which cut across them.