10-to.com

to

People say "to" when they want something sent somewhere, someone included, or a limit reached. It is the most common word in English after "the."

What a model may hear

destination address email headers, networking, routing: may look for a recipient field, filter by target address, or route output to a specified endpoint
type conversion programming languages like Python, JavaScript, C#: may call a conversion method (toString, toFixed, parseInt) or cast between data types
range endpoint databases, spreadsheets, slicing syntax: may treat the value as an exclusive or inclusive bound in a query or array slice
infinitive marker NLP parsing, grammar models: may tag the following word as a verb base form, affecting parsing of command intent

“Send this to my wife”

Meant: Deliver the message to the person's spouse

May be taken as: may look for a header field literally named 'to' and fail, or require a formatted email address

Say instead: “Send this message to my wife, her name is Jane Doe”

“Change it to 5”

Meant: Replace the value with 5

May be taken as: may call a type conversion function rather than replacing the value, or ask what format

Say instead: “Replace the value with the number 5”

“From Monday to Friday”

Meant: Including both days through the end of the week

May be taken as: may treat Friday as excluded in a database query, returning only Monday through Thursday

Say instead: “From Monday through Friday, including both days”

Say 'send to' with a name, not alone; models trained on mail systems hunt for addresses
Say 'replace with' or 'change to' explicitly; 'to' before a number invites type conversion
For ranges, say 'through' or 'including both' to override programming conventions of exclusion
When giving a destination, add context like 'by email' or 'in a message' to avoid routing guesses
Avoid 'to do' as a noun phrase; models may parse it as an infinitive verb and lose the task meaning